

Does he have access to the proprietary sales data of Nintendo, Xbox, Sony, Valve, and Google?
I’d be shocked if he did, because those companies are all big enough to have their own in-house departments for that. He’s trying to sell consulting services to smaller publishers. Consults don’t get paid for saying "well I don’t really have enough information to say that for sure*, they get paid for making executives feel smart.
That still doesn’t include most of the data necessary to reach this conclusion, and furthermore the bigger issue is that THE ARTICLE ITSELF DOES NOT CONTAIN ANY. It is an unbacked claim that we cannot verify. If he can’t share the data because ris propriety, he shouldn’t be making the claim publicly.
He’s looking at software sales in a vacuum, and he is probably correct that any singular piece of software would sell more units if it were released on more platforms. That’s not new or interesting: that’s obvious.
What he’s missing, even in the screenshot of claimed data he has, is everything else.
Consultants like this are not trustworthy sources. They’re trying to sell their own product.