EDIT: STILL POSSIBLE. Disregard my earlier comments about not being possible in super.
A true unbuffered 720 is possible in the game, however it is nowhere near practical:
However, there is another option to do a practical method in pulling off a walking/standing 720:
The general idea is to buffer a 360 off of something (minimum input for a 360 is really just an old tiger knee motion :r::df::d::db::l::ub:), a jump, a whiffed/blocked/hit jab, take a step forward slightly, then do another old tiger knee motion (:r::df::d::db::l::ub:) and end with :lp::mp::hp:.
Buffer this into something: :r::df::d::db::l::ub: -> walk forward or backward 1 step -> :r::df::d::db::l::ub: :lp::mp::hp:
Visual on how it’s done: