I think the drop in KBB value of our cars has everything to do with used car market has been put on downward pressure ever since it reached the peak of its insanity. It is always bound to happen, and has little (if at all) to do with the reliability of the car itself. The release of the new gen. in general, doesn't help the resale of the outgoing gen. either, so there is that. I've checked out the 11th gen. 1) just because I was curious of the new car and 2) I was curious what the dealership would offer vs. other vendors. I've seen a drop of like $6k myself in the matter of a few months too (from 33k to around 27k). The 11th gen is nice, but in my opinion, there isn't a whole lot to worry about. The new upcoming Camry will probably have a better chance of blowing the Accord outta water, which will definitely have an impact on the current Accord's resale, but whether it'll have the same magnitude of impact on the resale of our cars remains to be seen. Of course, if that does happen, Honda's response to that is what I'm waiting for.
In terms of reliability, generally with the Accords, if there isn't major issue mechanically with the model by its second year, there likely won't be major issue with yours either. Even if there was, chances are Honda would have solved / reached resolutions that would have ensured owners of their cars are taken care of. I don't recall seeing many serious issues with regard to the 2.0t / 10AT at all, other than a few questionable posts about the 2.0t and a few posts that did report problems. I also remember seeing someone posted here with 10G 2.0t reaching 200k miles with just regular maintenance (it was a 2019 if I remember correctly a while back too). I only have 40k on the car so far, no mechanical issue whatsoever either. So generally speaking, it seems to be fine so far and I have no real concern with regard to its reliability in the near term. If in doubt with its long term reliability, I'd consider getting the Honda Care extended warranty. I got it a while ago because I'm most likely keeping the car long term now.