Don't remember password
No access to email
No signed message and a stake it in the forum or at least did not have any address posted on the forum which the member can still access it and sign a message from it. However, to do it, that address must come from a non custodial wallet which allows to sign messages.
Combine them, it's impossible to recover the account.
Yes I also think that way as he is not having any access like to his mails and don't know the password and moreover he has not staked the address so that he can verify by signing a message from that address and under these cases it's impossible to get the account back.Moreover as pointed above he just ask this after long period of inactivity which arises suspicion even more and newbie account which doesn't have anything special associated with it why he wants to recover it? But in any case I don't find any ways to have account recovery but he can try once.