Phil does seem to have a weird thing about his handle, though. He'll shoehorn it into games; in RPGs he is DSP instead of even Phil. When he plays online games where he can pick a name, he could possibly delay some trolling by not naming himself DarkSydePhil, but he does it every time anyway. Someone said earlier, and I think they were right, that he also used it for his Brazzers account, which is how it was found.
He shrieks at his fans for not using the same name everywhere, but it's something he does religiously, even for embarrassing things he doesn't want people to find. TheyCallMeDSP and DSPGaming seem to be his acceptable alts.
He's walking a fine line right now. If the account logs in at appropriate times for Phil, it's likely him. If it never logs in again after today, it's definitely Phil. Let's see what we get.