Unofficial extensions are still being updated. I've got working bato and everything. Haven't run into issues so far. I'm not sure how this korean company got to them or why, since they're not even hosting the content. But either way, things should be good for now.
Tachiyomi is too good to fail. It's the best manga reader that has ever existed. It's open source. If they need to offload extension support onto less organized entities, then so be it. The community isn't going to disappear.
It can apply existing concepts in ways we haven't thought of. AI has been used for exactly this thing for years in chemistry. When given constraints (less lithium) and parameters (with this much capacity) it can try permutations of various designs that theoretically meet those conditions.
Yes AI is overhyped, yes it's often exaggerated by news sources, but that doesn't mean AI is a non-invention or something. It's a long way off from any of the lofty goals that are often thrown around by tech ceos, but that doesn't mean it's useless.