I find the Gen-XYZ thing to be mostly american culture war.
And sadly I think this is just another tool in their culture to create division, and of course conquer as consequence.
According to Wikipedia [1] "The contemporary characterization of these cohorts used in media and advertising borrows, in part, from the Strauss–Howe generational theory" but the chart over there despite being captioned as "Timeline of generations in the Western world" seems to be very USA specific given the definitions in the text that follows it.
I don't know, the rare times in which I hear someone use derived terms like "boomer", they get weird looks like they are some sort of imbecile. This kind of division does not get much traction in Europe, I guess.