Lemmy is technically capable of communicating with anything that speaks the ActivityPub protocol: https://fediverse.party/

It’s kind of like SMTP/IMAP or XMPP or Matrix. Some software may implement more of the protocol than others, and some may implement the same thing in different ways, some may even have their own extensions that others lack or don’t care about, etc.

Yeah that’s the joke. Reverse engineering an open source projects is complete nonsense. It’s like saying “I reverse engineered this book.”.
Just like a book, code can only be read and studied, because it is already just accumulated knowledge that can be directly understood.
What they did is take the lazy route while trying to make it sound like they actually did something other than prompting.

It’s just a fancy way of saying they were too fucking lazy.
It’s like the people who’ll ask some LLM to summarize Books and E-Mails for them, and then think they “know” everything they need.