It's hard to know what he exactly means by this. It sounds pretty bad but this guy does seem to attract and develop a fair bit of drama and this could be a bit exaggerated from the truth.
It very likely is. By "abusers" he likely means "people that are rude to him online" and by "stalkers" the same. Nobody is following him around IRL. He probably is referring mainly to the Kiwifarms people that get a kick out of documenting the downwards spiral of someone like Hector.
For clarity, it isn't that. He's referring to a single specific person who engaged in stalking and personally harassing behavior unrelated to the projects. The receipts are all over, you can find them if you insist.