Don't know about the Buick, but there are at least 3 variants of the AISIN UA80 / UB80, and it has been used in an absolute ton of vehicles. 2018 and up Camry ICE, 2019 and up RAV4 ICE, a whole bunch of other fwd Toyota's. I would think with the millions of units out there if these things were giving up we would have heard about it a long time ago - we wouldn't need a class action.
There are lot of variants sold to other OEM's - VW, BMW etc. And there is a similar transmission for the rwd platforms.