He has said that, but you know how creatives are. I get the impression EPHY burned him out a bit. He might continue making games after this if he feels refreshed, might stop making games altogether. Who knows?
From 2023 I think. I did double check, "final" here does in fact translate to final. I'll be really sad if he does stop. Maybe if it becomes something that makes him more money he'll continue, but what are the odds of that? Maybe if someone prods Kagura Games into picking the EP series up and it gets a Steam release, but I'm not sure that's a viable path.