Well guys, I pm'd Magus how to learn the upb edgecancel thing, it's not going to be fun. I'll get around to it in about a month if noone else does. If anyone can provide a video of them doing it in AR that'd be great too.
How to do it with AR:
If you hold R and press down on the d-pad a few times you'll see an orange diamond shape appear ontop of the characters as well as the stage switching to bare walls and such. Using R+up on d-pad to switch to just hitbubble mode will make it easier to see, c-stick rotates camera, d-pad right+c-stick moves the camera, and d-pad left+c-stick zooms in/out.
That orange diamond is basically the space that your character actually occupies and is used to determine collisions with things like walls and such. It stretches around and reshapes depending on the animation you're doing. There's also a darker one that shows the previous frame's position, and a white outline that shows your raw location of the current frame before any environment collision adjustments/fixes (if there are no adjustments it overlaps the orange one since they'd be the same).
You'd want to get close to the edge using a repeatable set of actions from a fixed starting point that you can then systematically tweak (like walk off edge for A frames using B strength/direction air control, jump for C frames with D air control, up-b with E direction on/during startup hop, angle on vanish with F, etc). Pay attention to the bottom point of the orange diamond since that's what decides when you're touching the floor or not.
The height you're at could be just as important (I think there's a good chance it's a key part of it), and you'd need to be at the right height during the reappearance to trigger a landing through the collision box reshaping on a certain frame(s), while also being right along an edge.
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