Look at a left flat 180 and consider that it’s actually a left underflip. Henrik did a legit one in a level one movie but 99% of the time people are mislabeling their trick.
honestly they just look like a flat 5 where the rotation starts a little earlier to me. Especially that "dub 5" from the fagan slvsh game - that was just a kang flip but he spun early.
what if it's with a hand drag though, like where you revert using the hand drag to change your momentum? I think those look tight.
But I agree about the in-air "revert" tricks, as impressive as they are, awkwardly flailing your body in the middle of a trick for whatever reason rarely looks good.