They're using vaporization for Sukuna's arrow for no real defensible reason in the manga. The anime you could swing it for Fuga, that's about it.Okay, so it seems like they did have the FTL Kimetsu like I thought they did, but they do have some really funky calcs about their speed:
Yeah, I can't buy that KnY is faster than MHA, especially the fashion of how they get those calcs(It's a similar problem with how they did Deku's speed feat which got them Mach 100 too)
This is weirder because from FV, both @ChaosTheory123 and PhantomFalcon actually get around 400+ Kilotons from Maximum Meteor... so where the hell they get 4.14 Megatons of TNT from?!
For the Meteor, they're abusing the shit out of very loose parameters for earthquakes on top of the fact the meteor was scaled off a random floor that isn't to scale with IRL parameters for the Shibuya Stream to get a meteor diameter nearly twice mine.