No, it is internal energy projection. Nejire Hado also has a quirk that projects her internal energy outwards as well. Do you count her quirk as being purely physical? More so than One Piece swordmen producing air slashes from swinging real hard?
all physical strength requires energy to use even in real life.
This is being excessively pedantic and disingenuous. You know that isn't what people are talking about in power scaling when talking about physical feats. They are talking about what a character's muscles are achieving, not any and all literal energy output.
If it was merely counting energy output then most quirks are physical feats because they are all outputting energy used by the body.
Any feat that is a result of Kaminari's electricity or Endeavour's fire? Not elemental feats, purely physical according to that logic.
that's not the point though.
You have no point. You are chopping and changing what counts and what doesn't purely to disingenuously benefit Izuku.
A bloke physically swinging an object so hard that it produces slicing air blasts? Not purely physical.
A bloke using a transferable generational energy stock piling ability that outwardly projects multiple generations of internally stored energy outwards? Purely physical.
