Just FYI, I have contacted Grant Thornton directly and am awaiting confirmation that this email and the "Claims Portal" are indeed legit or if it is another 3rd party "scam" like that cryptopia rescue outfit... I'll update if/when I get a response.
I also receive the same mail I think it's not connected to them and I didn't bother to open the link since I'm afraid it have a malware or any phising attempt content. But if those mails really came from them I wonder on why they didn't update their community here.
I think the best thing to do is to wait for the update for full clarification since to for sure many cryptopia users still want their balances back.