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.
Like I said, Kano is probably one of the few exceptions. Maybe Kenshi's bf1 or Jax's fireball spam as well but those are both highs. Most characters can't even think about throwing a projectile against Inferno Scorp, that's my main point.
The low demon you cannot react to, especially if you are using feints. I know the frame data says it's 28 frames but I doubt that is correct. The animation is not telegraphed at all either. By the time you see him grab the skull it's too late.
Regardless if you think it's reactable or not, if you know they are going to use a Mileena roll or a Sub Zero slide to get passed demons, you can meterburn the low minion for better tracking to give you a full combo. And I don't see how 214 provided a mixup. The low minion is much faster than the overhead. The mixup is easily fuzzyabe.
In fact, your 214~DB1 that you're so upset about is actually punishable by most of the cast. Even pre-patch. It's at least -7. You should've be doing the teleport cancel to be truly safe anyway.
You'd think someone who mains Inferno would already know all this stuff.
EDIT: Taking a closer look though, there is definitely some extra scaling going on with his low minion. That sucks. Another phantom nerf it looks like. So the meterless damage I thought he had appears to be gone. Brutal. Knowing that, Inferno is probably the worst now. RIP Inferno Scorp lol.. But not because of 214>DB1 for God's sake.