Don't pop and use the center of the tail like you would for a pop shove for these. When setting up, what matters is the big toe on your popping foot should be in the upper corner of the tail, almost covering the back wheel (actually a rather unusual position if you're not used to it from different similar tricks already). Front foot goes wherever you're most confident easily getting it out of the way without interfering with the board. Then when actually going for the trick, you're supposed to jump straight up off that exact pressure point on the tail, using nothing but said big toe for leverage and sort of digging in with it as if you wanted to force the board through primo with enough precision that it flips the whole way around. Front foot does absolutely nothing and just hovers over the trick as you suck your legs up once it's formed, then comes back down.
Trick essentially comes down to forgetting everything you know about pop shoves and how to keep them flat to instead insist on the complete opposite. The 180 of the board is relatively unimportant for this one, you want to focus on initiating the flip first and foremost, so you load the trick from that position I described and only then you jump whilst still insisting with the toes until they literally push the board through the beginning of the rotation, which sort of happens diagonally and through the scraped tail (not too dissimilarly to ollie impossibles, except instead of guiding the board around the whole way, you let go of it as it starts coming around and maybe keep pushing through it an extra second to make sure it completes the whole flip).