Wallet address are sometimes sold with an account, hence let's see a signed message from a time prior to when the hack is supposed to have occurred.
Given the OP is in no hurry to remove the hackers posts (that and my original request was made back on the 30th of April 2020), then I am also in no hurry.
Let me point you to a message signed yesterday from an address that was posted (in 2015) AKA 2 years before the hack (hack= sometimes in 2017).
CLICK HERE