Your video is privated on youtube, I still verified it however I would highly suggest and recommend to un-private the video, unlisted works just fine.

Hey, I am really sorry for the late reply as I don't go on here that often, if you're still interested in how the clips works it's really simple but rather inconsistent at times, all you have to do is climb an object and enter left or right input roughly at the same time, I do not know the exact timing since like I said it's rather inconsistent and couldn't get it to work 100% of the times even when messing around with macros/keybinds in practice to try and find out how to make it consistent. You can also input a "forward" input at the same time so forward+left or foward+right if needed.