I've seen several incorrect posts by now. To be clear: Mixin lost $200M, not Mixin Safe.
As far as I've seen, only Mixin Network is mentioned and within that, there are different groups of services. Mixin Safe, MixPay, Mixin Wallet, Mixin Messenger maybe something else. Apart from the statement "Mixin Network's cloud service provider was attacked by hackers", I have not seen anything more detailed about which part was the subject of the attack
Yeah they all definitely belong to the same person/entity. It's yet unclear though which part of their network got hit or which app had the vulnerability which lead to such a tragic outcome. I also haven't seen any official press release or statement by Mixin group employees. Mixin Safe was in beta I believe but still they will at least have to change name/rebrand if they're planning to develop it further.