You can't blame him at all, because that exploit wasn't used in iOS 7's jailbreak and iH8snow has nothing to do with evasi0n.
Read up on some facts before you run your mouth off.
He's saying that the exploit was burned in his iOS 6.1.3/6.1.4 jailbreak. He's right though. iH8Sn0w used an exploit that was around for about 2 years now. It was used to jailbreak an obsolete iOS 6 firmware. What's better, an unknown (to Apple) exploit so hackers can always get in and explore iOS for further exploits, or use it for an old firmware that most people dont use? On top of that, I think it was only used to untether A5+ devices.
Not 100% sure about that last sentence but the fact remains, he used the exploit for a firmware that is on about, I think at most, 20% of the iOS devices. Kinda shortsighted but I'm sure the people who hate iOS 7 are happy. Oh well. Probably will just have to wait longer for a jailbreak in the future (with hopefully 7.1 being the exception but that's anyone's guess).