From my understanding, Android is usually the last platform to adopt new features. They do have AI definitions, yes, but they aren’t easily viewable for yellow words. You need to click multiple times in order to see it. Once AI definitions are easily viewable for yellow words on Android, I’d be interested in trying it out. Perhaps this will drastically speed up how definitions work on LingQ.
These days, perhaps my main use of LingQ is as a stats recorder. I also try and share great content I find with the LingQ community, but there are bugs with regards to this at the moment with regards to YouTube imports.