The removal of the red wires is just that. Out of the 4 ESC's you are using, remove the center red wire from 3 of them. I would suggest undoing the clip, and putting heatshrink over them, but you can also just cut the wires if you don't plan on using the ESC's for anything else. But, if you lose a BEC in one of the ESC's you are using for power, then you will have to resolder the wire you cut.
In theory, you should not have any adverse effects using all 4 of the BEC wires. It's like wiring in parallel. But, many will tell you do to it. When I was using two or more ESC's, I never unplugged the wires and never had an issue. I will leave that one up to you lol.