To your point, we can't be certain these tools are why Mr A has been so successful. There's no control group. It's possible only one is cause, and the rest correlation.

On top of that, your or my results may vary. What if his "tools" made you, your family and/or manager miserable? Is that "success."

I'm an older white male and even I'm troubled by the old white male paradigm of success. That system works well for some. But it's less and less so for the rest of us. I'm not saying it's wrong per se. Only that we'd all be wise to think outside that paradigm. To consider optimizing for things other than the usual suspects.