No, actually I didn't have any GBP account when I received that e-mail. I was curious about that sentence, so I went to my Wise account and opened a GBP balance. It was opened immediately, without questions or further proofs requested.
I got this reply from them:
Not very promising, but since I have no US operations (only EU customers) I guess I can live with GDP or EUR until I sign up at another EMI (if there is still any of them accepting my foreign-owned, non-US operation business...).
Exactly the same for me (problems with Mercury and now Wise with this form)! I just sent an e-mail to support to see what can I do to keep my USD account open (if actually possible...).