Can you sign another message, including today's date?
You may also want to delete all posts that you didn't make, to prevent being blamed for plagiarism later on.
Sure, here you are:
-----BEGIN BITCOIN SIGNED MESSAGE-----
My account AvenG (ID:67153) has been recovered on 22th February 2019. Today is 2nd March 2019 my alternative account is Mapuche33 (ID:2328967). Thanks LoyceV for helping :)
-----BEGIN SIGNATURE-----
1KmUUTK82zhp2QYULV6CXGbZofepBEpziV
IKtix8lFG3PUU1dMWgARsysh1zNJxc6D3K96vyCeTrEoINn7Q+wyjABuY2SvEKd0IXwoBsZzVE/AYU7rfWzpnJg=
-----END BITCOIN SIGNED MESSAGE-----
On regard of the other, staff already replied me saying that unfortunately there is no easy way to delete posts and threads. They said that maybe there will be such feature when the new forum software is ready.
Sadly it is not possible to select a recovery point in time to get back to normal prior the hack... So I 'll be wasting my time deleting unwanted posts manually.
They also stated that is not possible merging two accounts. So I'm gonna live with both of them linked to the same address I guess.