Yep, all I have ever seen from that website is articles making grand statements based on protondb statistics that don't support them. At least now they have a list of disclaimers at the top that let you know reading the rest of the article is pointless.

Even their disclaimers are biased though like "This may not be completely representative of all Linux gamers either.". Ooh, "may not be", you don't say... I would guesstimate that not even 20% of Linux gamers make reports on protondb.

Also, ignoring all the misuse and misunderstanding of statistics, who cares what distro is supposedly most popular. Use what works for you.