I have come to "know" Dee as someone who is emotionally invested in the program, likes being a part of the fanbase and camaraderie associated with it, and is generally careful with the information that he puts out for public consumption, with the caveat that his emotional investment and caring for the other fans of the program sometimes lead him to behave or say things somewhat out of his true character.
My guess is, he has left the forum either because he is frustrated with the program beyond the end of his rope and doesn't want to say things on here he will later regret... sort of like taking matches away from a pyro, or an alcoholic pouring liquor down the drain. Better to not have the ability/temptation available... OR, he has gotten so fed up with certain posters stalking and trolling him that he just said F it.
Hopefully, he will be back at some point. Even for those who wanted to call him out for being full of crap (which I never thought he was just for the record), but worst case, even if you didn't like him he was entertaining and better to have on the board than not.
If he is gone for good, let me be the first to say via con Dios and we will miss you @BrooklynDee.