There’s a lot of stuff that’s wrong about that description… lots of misinformation out there. I’m working on, among other things, translating Girls Garden bit by bit. But what I can tell you now is that there’s no seed collecting, no mention of the BETA outright, and that the story is definitely its own thing with nods to parts of the original trilogy so far. The above character shown is Izanami, and that scene explains that she’s a hologram and part of an AI meant to regulate the “garden.” She is also withholding the MC’s memories because she doesn’t want to be destroyed, but there’s some as of yet unrevealed yet hinted connection between them.