There was no need for a demonstration, the article went into detail explaining their numbers. There was no need to sensationalize the information. Thats bordering on fallacious arguments, well not bordering, it IS.

It’s based off of somewhat available statistics, some games release sales data and you can extrapolate and get a decent sample size. So not a wild guess in the slightest. Steam also has all that information internally, you can go verify the claim yourself if you want. But there’s no need since plenty of people have done it multiple times and found the averages based off tiers of sales.

And it’s moot, I can provide dozen more similar claims, there’s even been studies done.