1) That's actually just straight up incorrect here. I've already given you an in verse example of how Dying will flames are not ordinary flames. They don't even burn like ordinary flames, and have been explicitly described in verse to be a unique kind of life energy. Verse equalization would not put these flames as fire. Period. Dying will flames are not flame based attacks, but energy based. Looking at any other type of dying will flames aside from the sky attribute would make that rather clear.
2) If Tsuna's punches can't even harm Steve then I'm almost 100% certain that this is a stomp.
3) Contradicts what you literally just said in your aforementioned point. And how much damage would Tsuna take? More? Less?
4) It depends on how Wither works. If it's AoE based, as the other potions seem to be, Tsuna's flight paired with his Hyper Intuition would be a very valuable asset. Having a possible sense of incoming danger, and having good enough instincts to instantly back off, well out of Steve's range. Also, I'm fairly certain that Tsuna is better tha Steve at CQC, even at this point in his story.
5) The first part of this is incorrect as well. First Edition is a sealing technique, so it cannot be broken out of with pure strength.
Xanxus has unique dying will flames that are more destructive than typical sky class flames. Yet even with that natural energy within him, he still couldn't break free. Secondly, the Plus Knockback enchantment really makes this seem like a stomp, as it takes away Tsuna's only main win condition. If he can't fight in CQC because of potions, and he can't seal him because his momentum will be reversed, what can he plausibly do to win? No win con = stomp.
6) High 8-A isn't a thing, but I see your point here.
7) Adds more evidence to this being a stomp. Tsuna literally cannot hurt him, even if he uses revised to increase his stats by 1.7X.
8) Mobility advantage isn't much when he has no other win condition. Only supports this being more of a stomp. Tsuna already has no long ranged options, and his only hax is unusable not because he gets zoned out by projectiles that he could possibly weave through, but because of nigh instakill potions and an enchantment that literally will reverse his momentum.
I don't see how it's not a stomp at this point. I can't identify a single win con for Tsuna here.