All of this is mere speculation, but…let’s say that perhaps BM has moved on with his life and is not really interested in this forum any longer. Since he hasn’t posted any comments or questions in over 1.5 months, that scenario is plausible.
Then, factor in the possibility that he might not even know that his friend/relative/roommate/child was doing damage while using his screen name.
Just a theory, but certainly possible, I think.