ST: Discovery is an "unstoppable monster"? Pshaw. Wake me when it's ravaging the ratings like a giant space-going tardigrade. Then we'll talk.
Heck, wake me when it has as many domestic viewers as Enterprise the day it was cancelled.
I can't deny that demand expressions are an interesting metric, and I do think they measure something valuable to TV executives -- buzz? prestige? something, anyway -- but we should not draw an inference that a show with high "demand expression" counts also has high viewership.
To illustrate my point, here's a chart from the company that measures "demand expression":

A few observations here:
1. Mr. Robot's year-over-year demand expression (which I think is best described as "buzz," although Parrot insists on referring to it as "demand") increased substantially, even as its actual ratings declined substantially.
2. Star Trek Discovery has routinely scored around 50 million "demand expressions" during a week with a new episode airing. On the one hand, that's comparable to Game of Thrones, which is a megahit with 30 million viewers per episode. (Truly stunning. That's more than American Idol averaged in its prime years, and American Idol was on broadcast!)
3. ...On the other hand, 50 million demand expressions is also consistent with Mr. Robot's performance during its lackluster second season. During the period where it was hitting 50M or close to it, Mr. Robot's real-world audience numbers were hovering around 0.8 million.
Buzz !== viewers.
However, strong buzz can keep a show alive even if it's losing money on viewer counts. That's how Battlestar survived to four seasons: audience was way down, but critics adored it.