> Can you say that about any project that was done before GenAI?

yes. the linux kernel and it's extensive mailing lists come to mind. in fact, any decent project which was/is built in a remote-only scenario tends to have extensive documentation along these lines, something like gitlab comes to mind there.

personally i've included design documents with extensive notes, contracts, meeting summaries etc etc in our docs area / repo hosting at $PREVIOUS_COMPANY. only thing from your list we didn't have was transcripts because they're often less useful than a summary of "this is what we actually decided and why". edit -- there were some video/meeting audio recordings we kept around though. at least one was a tutoring session i did.

maybe this is the first time you've felt able to do something like this in a short amount of time because of these GenAI tools? i don't know your story. but i was doing a lot of this by hand before GenAI. it took time, energy and effort to do. but your project is definitely not the first to have this level of detailed contextual information associated with it. i will, however, concede that these tools can make it it easier/faster to get there.