I doubt it. Helius has also claimed he worked at Bethesda and Google and that he's hired staff from Ubisoft who were working on AC (and that similar companies were directly poaching staff from him). He just likes to name drop because he think it makes this project sound more serious than it actually is.Rumor has it that this studio has a lot of former MHY employees?
If half of this was real do you really think they'd have a login system that starts erroring at ~400 concurrent users, or that they'd have gone with a REST API for their network model?
It's more likely one core dev, Helius, and occasional commissions for art/animation or dev work he can't handle. He also hired the person in that comment I linked to fix his netcode which is not something you'd expect if he were swimming in competent devs from well respected studios.