That's the point, Lamboman, he is a member, he no longer wishes to to, so it's down to him to just stop accessing / posting etc.
If his will is strong he can just avoid.
If he's not strong willed then change password to something random and unknown.
It's really not hard.
I'm sure he has his reasons which would make it clearer, and as previously suggested he probably wishes all his posts and reviews are removed. But as per the rules, posts are rarely deleted, and then, I beleive, only when to much personal info is given etc, no other reasons than that.
Move on, nothing here to see.