First, this was the reveal trailer and not the gameplay trailer. So we've not actually seen all that much of the actual gameplay yet.
Second, the screenshots are from a debate event, not from classes. Debating is a separate activity to classes so that says nothing about how lectures will look.
Third: as others pointed out, the description of the pack mentions attending classes vs working on presentations or projects.
"Not all images appear in-game." is pretty typical for game trailers, not just The Sims but others too. It's not like a movie trailer that only uses footage from the actual movie (and even movie trailers sometimes contain parts that get cut from the final product). It means that maybe this room was built to showcase debate but it won't be included in the prebuilt lots, that maybe there won't be Sims wearing specifically those outfits and being part of the debate clubs, etc.
It's an academic building, yeah. But it's just as likely to be a lounge or a library or a common room as it is a classroom (and those chairs are base game ;)). Debates take place in a variety of locations, depending on what the school has available. And yes, students will wear "uniforms" or rather clothing with the school logo, ideally clothing that I'd call "Sunday best" (blazers, shirts, ties, etc).
And anyway, just as many people requested the social activities related to university life as the education side. If anything, I've seen more requests for parties, juice stands, etc than I did for active classes. I'd wait for the gameplay trailer and more information before assuming what you did here, OP.
Personally, if attending lectures is a rabbit hole, I won't be bothered. There's going to be stuff that Sims can actively work on for the academic side of it all.
