idk how but i just clipped through wall like run slide into wall and climb up? inputs sth like w run into wall thun turn 90deg. right then a and w and camera back. no vid(

Any specific spot you did it at? Maybe you could try replicating it on video cause it's kinda hard to understand through text.

Got it in my run as well.

Though the method was quite different, and I don't think you can really utilize this weird ledge grab.

Adding to this, you can wall clip and go out of bounds in Chapter 3 (don't know if that's known already). Grabbing on to the wall in the right spot pushes you OOB. You can use it to get to the crystal behind the gate (not shown in video)