I can make a video showing that he can, from any range on screen.
Mileena can trololol roll through any demon on reaction, as can Sub-Zero slide through any demon summon on reaction. Also the 214 string did more than just chip damage, it was a hitconfirmable string that lead into an overhead, a low, a mid demon, however now the only thing I can do from it is 214, DB3F and get the hell out of dodge. I don't know what Inferno offers over the others against Quan Chi, I'd actually assume that Ninjitsu would be the best.
And from what I understand you don't play Inferno, so how would you know how much that string means to Inferno in the first place. The very threat of the aftermath made the opponent's freeze, allowing him to get away with not cancelling 214 at all, and jumping back in while they were still hesitating. Now I can't be safe up close as every other string he has besides B121 and 123 are not safe on block.