He's talking about ME of course!
while the dude at Retro may be telling the truth about playin it, I highly doubt that he game is completed. Another problem I have is this dude seems deeply rooted in the fangame community. One thing I know about those guys is that knowing how to make a game themselves makes them incredibly harsh critics, even to a fault. The troll in question recently posted this in regard to why he won't post a screengrab:
"Screenshots wouldn't work either, since I'm (modesty aside) a very good artist, I could pretty much fake a screenshot and make it look like the real deal. (read: Sonic Nexus Attitude XD 3D). Plus, I have a small project that plays and looks like Sonic 4, so never take any screenshot that comes from me as actuall proof. The same applies for ofscreen takes. I could pretty much be taking pictures of my own monitor..."
so not only did he complain about the physics, but he also believes he can do as good or better work than what we've seen of Sonic 4. Definite ego problem.