That's just a single one-off episode, this seems to be a recurring character. Why do you think that representation should only be a single event in a show? If we made TOS now, we'd have fans argue that instead of Uhura, we should have an alien with dark skin show up to teach us about racism. Then they go away forever.Sorry, but no, I don't think so. As I said upthread, if you want to use a sci-fi setting to its fullest (e.g., the "literature of ideas") you need to do one of two things:
1. Deal with imaginative technologies, concepts, and settings and see what the ramifications are,
2, Use a setting which isn't the mundane present to tell an allegorical story.
I do agree that in general fiction cannot be viewed as anything other than "of its time" and regardless of intent science fiction will seem antiquated in some measures just due to the faulty projections that are made about the future. Trek has many examples of this - most notably that computer technology has generally been shown as less advanced than what is possible even today. Even Berman-era Trek basically didn't have anything resembling the internet shown on any of the shows, even though it was fairly well established by later period. Then again, a lot of "pros" effed this up too.
Regardless, this isn't the case of making a bad call about a future tech. This is a case of basically ignoring a tech which exists right now, which could be much sloppier. I will reserve judgement because we don't know how it will be depicted onscreen, but at minimum I would hope there would be some on-screen reference to use of wheelchairs being far more limited in the 23rd century than today.
But there is of course the other point - the one of allegory. This is why you didn't need 23rd century wheelchairs to tell a story about disabled people. Because a sci-fi setting allows you to expand the concept of disabled considerably.
Here's a hypothetical Discovery episode. The Federation makes contact with a race of beings who have augmented their neural functions with circuitry for generations - similar to the Borg, but to a more limited extent. Everyone is outfitted with a brain-computer interface in childhood. Information is "downloaded" directly into the brain as needed, with written language even falling out of favor. Physical or verbal interfaces have become a thing of the past, because people can just think computer commands. Most people that is. A small minority of the population has an overactive immune system which rejects the neural interface. They must do everything the old fashioned way. They have to learn things through the laborious process of study. They need to have special interfaces installed in order to get anything done. They might not be openly stigmatized, but they have their otherness constantly thrown in their face, having to work their way through a culture not designed for them.
See, I just put together the framework for an allegorical story about disability. Even better, the potential protagonist (er, guest star, I suppose) is someone we wouldn't see as disabled in our own culture. Hence it gets across the idea of what it means to be "disabled" to someone of normal ability. This is the core of what can make a science fiction story unique - what can only be done in a SFnal setting. And it's why just having a "future wheelchair" just seems monumentally cheap to me.
The very best scifi is taking present day situation and exploring them in the future. Part of this is going to include having people who were normally ignored by the media except as guest stars or random appearances for a moral lesson, in this case wheelchair bound people. Exploring the how others fit into society is far more interesting than exploring a wacky alien race. There are lives that are rarely explored in any form of media. Scifi allows far more freedom with that and opens up new possibilities. You're wanting to cut that off forever just to have another alien race entry on a wiki. It means nothing, it's just an episode of the week with a new forehead alien. Another forgettable episode with a moral that gets forgotten by fans judging how many of them behave here and elsewhere. They can join the list of aliens meant to be stereotypes that we'll look back at in horror one day. Do you understand why Uhura and Sulu were important as characters? Why having Sisko or Janeway as captains of the series meant something? Why Burnham and Stamets as main characters mean something?
If you're still having trouble understanding how someone with a disability can exist in Star Trek despite current medical advances outpacing the show.

In the future we can probably regrow eyes or recreate vision identical to what humans are used to, we've had success with it to some extent. Wearing a bulky device that required a brain implant just doesn't make sense. I guess we'll just need a species that's blind, but uses echolocation.
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