IMPORTANT! You also need to remove the two T10 screws labeled B1 and B2 in order to remove the motherboard! I had to figure this out on my own.
I didnt see this before, so thankfully I was able to use T9 without stripping the screws!
They should add this to the guide! I didnt know that, and did some minor damage to the bottom piece where that main clip is.
I dont mind because it's my own Xbox, but what if it belonged to a customer?