Yes, it could've been forged and they would need more proofs for it to be real. Plus the "Q" in that email could represent anything.
I've been on the bad end of a dox and from experience, forged screen caps of emails and convos in messaging apps are the easiest to do.
The more I think about it the more I think it's a fail dox and even a fake dox.
What's strange is how hard they're trying to discredit Q.