I've looked into this for a while, but I can't find anything. Could someone explain how to figure out how many frames need to be saved in a level to save another framerule?

Not sure if this is the best place to ask, but I couldn't find anywhere better. I'm working on TASing a hack, and I can't quite figure out how to do flagpole glitch in one of the levels. I'm starting to think it might not be possible here, but I thought I'd see if anyone had any ideas on how to do it. Here's a video showing what the end of the level looks like: