I'd like to point out we aren't told the Nomu's condition, for all we know it could've survived that blast just fine if Shigaraki hadn't told it to burst. Nothing stated it was dying even without the explosion. Shigaraki killed it by ordering it to self destruct.
Shigaraki saying that the attack would've killed anyone but himself, while not a direct and conclusive evidence, may suggest that said attack would indeed kill anyone else. Even if Shigaraki avoided death by digging on the ground, which in of itself is also another circumstantial evidence of the danger of the attack. He called a mistake in that moment a
fatal error, after all.
Being damaged by the explosion and not the heat is an assumption on your part as well.
When Bakugo hurts someone with his Explosions, our first and foremost assumption is that he did it with the force of his explosions, do we not? So is most, if not all the explosion feats we have seen, calculated, and used for scaling for MHA.
We've only ever cited the temperature of Bakugo's explosions when it's used against someone far more powerful than himself, like All Might.
For most explosion feats, the fact that the explosion's force harmed the target is our most natural conclusion. We'll have to further scrutinize if there is a situation wherein we are assuming that the only factor to a feat that involves
Intercontinental Ballistic Missiles is only the temperature.
Of course, Tiamat and Explosion are two different things, I was just making a comparison.
The missile punch is upscaling from the 1.54 Teratons blast, with the Low 6-B calc just supporting that ratings. Especially since we know it would be higher than 1.10 Teratons. As once again the majority of that value is coming from the shockwave the explosion produce. Which means the actual blast would be stronger.
So it scaling above 1.54 Teratons isn't absurd.
This would mean that the Nomu wouldn't fully scale to the Cruise Punch, right? Since, if I'm inferring correctly, the anime might change the energy yield of everything except the shockwave (or even the shockwave)?
Also, I take this as confirmation that, if the two Low 6-B calculations are accepted, we're no longer going to use some of the High 6-C calculations and ratings then?
Because they will have no place in the scaling chain with the exception of the low tiers. Having the Near High End scale to Low 6-B means most characters that are currently 7-A would be Low 6-B as well, and scaling them to the Cruise Punch also makes the scaling chains still problematic (ignoring the possible increase in yield in a possible recalc of it).