I don't know, man, it doesn't make any sense.
Its almost like they changed their minds half way through or ran out of time maybe, but even that doesn't work as basing a new design on an established one would be far quicker than starting from scratch.
What I think might be going on in the thinking behind the new Klingon ships, based on two things; 1). knowing how some modern film-makers tend to think about changes like this, and 2). reading two years worth of statements and material surrounding the development of Star Trek: Discovery - is this....
....I think, basically, that the producers of the show think that they are making the Klingons more alien and intricate for an audience used to less humanoid aliens in video games, and other modern media - like say, the Covenant from Halo, the Krogan from Mass Effect, or the Fallen from Destiny. They feel that new audiences, raised on the less constrictive media than television, wont take alien antagonists seriously unless they are visually quite exotic, and packed with filigree suggesting high budget. I personally disagree and feel that Star Wars, Star Trek, etc, do quite fine with humanoid aliens, or plain minimalist Stormtroopers as antagonists, and much of the interest in a society comes from how it is written, not how it looks - I'm a video gamer as well as a Trekkie, and often (not counting the esteemed and incomparable Mass Effect) video game aliens are quite bland culturally anyway. But as part of this thinking, which also lay behind a lot of the choices in the Kelvin movies, some of which were controversial, they feel they have to authorize vast departures from established designs, for the sake of attracting a new audience, and being artistically novel.
Now, as we have said, this is an unwise thing to do while simultaneously putting out interviews in which you claim
'all discrepancies with canon will be explained in time, and arn't what they seem', or the show is
'Prime Timeline, and set ten years before TOS'. That is basically telling audiences the exact opposite of your intention - you are making a reboot, but telling them you are not. When they say they are being faithful, they may just mean to broad themes, quirks of dialogue. They should clarify themselves, or risk yet another controversy that alienates fans, if so. Say it definitively, or else, maybe backtrack and throw in a few K't'ingas and bearded Klingons.
The Klingon ship above looks like it's keel was laid down by the Borg, based on sketches sent to them by lead designer H R Giger. It's very video gamey, in the sense that it's got polygon overload and looks like it was created by a graphics designer who wanted to make something chiefly 'look alien' or 'look ornate' as a criteria. We are assured that designers research the material they are working on extensively before approaching it, but I get the sense that, perhaps, the designers know what Klingon ships role is in previous Star Trek academically, but don't know their value in context, or else they would know the value of the Klingon battlecruiser having a recognizable shape.
The problem with their choice of highly ornamental ships for the Klingons, is that it flies in the face of a hell of a lot of Star Trek's visual design history. The ornamentation of the Klingon ships almost makes them look like something out of Final Fantasy, full of purely decorative spines that probably do nothing, other than rendering large parts of the ship's internal volume useless. The Star Trek franchise is malleable, but there is a lot that shouldn't be changed simply because wisdom makes the change unnecessary - the effect can be achieved alternately.
The Krill in the Orville basically serve the same thematic role that the Klingons and Romulans did in TOS and TNG, and really capture the feel of what they once were - an antagonist who's values stand in opposition to the Federation's democracy and individualism - and who's ships act like a French frigate in a Hornblower novel, or a band of outlaws arriving in a Wild West town - they roll up in orbit facing off against the hero ship, and contend for the resource on the planet below.
The Klingon battlecrusier, like the Romulan warbird, is iconic as fuck for having played that role for 50 years from 1969 to 2009 - the ship speaks of Klingon identity like an enemy sailing ship "running up the colours" and facing off against their rivals in a high seas adventure. This is what has been missing from these Klingon designs - and why having a recognizable silhouette was important.