It's both sardonic and genuine. If he's genuine, then I genuinely wish him the best luck. However, it is very hard for me to believe that any billionaire would ever do something generally disfavorable to the current billionaire class. It's even harder for me to believe that, if one of them was to do so, that it would not be for their own further gain, just to the detriment of their peer cohort. I'm a bit jaded from having been lied to too many times.
Again, however, if he is genuine: I genuinely wish him the best luck taking on his matched opponents.
I have to admit that for as corrupt as Illinois is, Pritzker has managed to support a few things which his billionaire buddies weren't too fond of. It's not all good, but it's better than I expected. He's called for higher taxes on the rich, stronger labor protections, higher minimum wages and better support for the poors.