if he is looping that kick just stuff it.
crouching mk works well, and so does standing hard kick. problem is, from its appropriate range it can be too quick to react to. if you block it, he has you where he wants you, don’t let him get there, find out where that range is where he can throw it, stay out of it, then walk into it and throw your dankyaku stuffer when you see his startup or feel he is going for it… reacting to it after it happens is gonna put you in a bad place. you can counter the aerial one by the way.
one trick you can do if you’ve blocked it, is crouch tech option select with cr mk (press downback lk,lp, and mk all at the same time. if he grabs, you will tech, if he does any slow move you will stuff with mk(4 frames), if he blocks you can just cancel the crmk into demonflip and go for a mixup, in fact if you stuff with it you should still cancel into flip. and if you’re cancelling into flip and you end up teching a grab, you wont flip. so its safe to cancell into flip…of course once he sees it coming, you have to change things up