It's obviously going to be hard to determine a number for a statistic like "most popular", and there are always very different interpretations of the available numbers, ending up with vastly different rankings.
It links to their method at the top of the statistics. (Oracle has basically a DB monopoly if you believe that ranking, as these are both owned by them)
It's dataset is probably flawed, but I think we can say
"Rumors of mysqls death have been greatly exaggerated"
There are stats that claim MySQL is used more, but I did not link to them because I don’t know if they are trustworthy. You, meanwhile, just made a fact out of thin air.
It is unfortunate how HN discussions has fallen. Not only are most ( if not all ) of DB discussions completely ignoring MySQL, it is as if Oracle and MS SQL Server isn't a thing.
we have been living in a psql era for longer than mysql, so it has had enough time to catchup.
If you feel otherwise it's probably that memory bias effect where distant events seem closer and we underestimate the passage of time,
There's an xkcd for that
https://xkcd.com/891/
"The death of mysql(2010) is closer to its birth(1995) than to the present (2025)" will become a true statement next year.