Trying to do the Prison Skip on MCC Xbox version but constantly failing. How can I improve on it?

So, I’m trying to do a speedrun with the IWHBYD, Piñata and Sputnik skulls on legendary and trying to do the Gravemind level.

However, I am having difficulty trying to do a particular skip for days. It’s becoming frustrating and I am looking for anyone’s method here.

Is there a method to sort it out?