It's relevant because that's what most people in Austria remember him for.

First he got famous for the Sky Dive from space

Then he made headlines for his facebook posts, sharing questionable opinions with the media, and supporting right wing politician like Strache (who is currently on trial for embezzling party money to fund his lavish lifestyle).

It's a part of his public persona, not mentioning it would be weird. It's not like he shared his questionable views in private.