That makes Ralf the second open lgbtq driver in F1 history after Mike Beuttler.
I guess that is an answer to whom that homophobic comment in the 2000s about "a gay/bi driver strutting down the pitlane" was about.
Some Germans on another platform said that apparently BILD tried to out him 20 years ago, but everyone refused to comment so they couldn't run that story back then.