You're missing the forest for the trees.
Yes, the first billionaire and ostensibly trillionaire is Gen X and the politicians are starting to move into the X/M range... and the M/Z are supporting it because they're sucking up the marketing like a hoover with a plan...
But Boomers still hold the majority of the wealth and make up a huge portion of the population. The billionaire class are going to grab as much of that as possible. Their imminent deaths will not create a massive redistribution of wealth. It will create a fucking feeding frenzy for the predator class.
We can point fingers at this generation or that, but not much separates me from a Millenial in age - it's not like a switch was flipped and this made-up term changes who I am. That's the sociological equivalent to astrology.