As other people mentioned, it's pretty much common thing for TMAN. He don't spend 365 days in year on forum. It's frequent thing that he don't post for few weeks on months.
OP, I understand that you had good intentions and was concerned about TMAN, but I'm not sure making threads about users who become inactive is needed. Unless they gone very strangely and questionable. People have life outside forum, so it's understandable that they disappear sometimes.