I think that's essentially giving an athletic category bonus for a very good CFA score. If you played varsity football for example, according to the oft-cited RAND study, you would get 600 pts in the athletics category. But that category bumps up to 800 for a 650 on the CFA, even if you weren't an All Area athlete. But then separately, you get points for the CFA that by themselves could max to 800 (this assumes the RAND study is correct).
Last year, I reverse engineered my DS's WCS. People will say "only USMA knows...", and yep, that's true. But I'm confident I got pretty close based on the RAND study and a study someone did at the Naval War College for their masters several years ago.
The CFA is likely worth 800 out of 8000 points. So every point you leave on the table does count in that max of 8000 points, but it doesn't count nearly as much as academics, which are worth 60%. Test scores, particularly Math and English, are the place you can probably most directly and potently help your WCS.
Of course, in the end it means nothing, and the advice to control what you can control and that it depends on your district and lots of other factors is the best advice. And of course, locking down the nom, for which the interview is especially critical if you are in a competitive district.
So don't waste your time trying to do what I did, and instead just put together the best package you can