nice article, covering the basics about fighters very well. The only thing I don't like about it is that "activate first to use a gap in the opponents screen"; it gives the wrong impression. There's no need for "gaps", fighters may move freely over/through any ship or squadron, you cannot block that movement. Only the end point of the movement is important, you may not overlap there.
Also, you need at least 4 squadrons to get any effect (better 5), be it as screen or for bombing. If you want to take less than that you better don't take any at all, it's a waste of points then.
Definitely agree with you here that 4-5 squadrons are a minimum for squadron superiority !
I think by what they meant by gap wasn't a physical gap, but more of a tactical gap. For example, an unactivated ships that is likely to throw a squadron command, bad positioning allowing you to move and attack without being engaged. That kind of gap in the enemy's battle plan 