Yes. In terms of popularity (installs/time) psql superseded mysql. Although of course at the tipover point msql still may have beaten psql in terms of total installations, i'm pretty sure even by that metric psql already won.
Source? I’ve only been using PostgreSQL, but I believe most legaxy systems are not going to rush to update, and world consists of legacy systems and systems that will become legacy tomorrow.
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.