I am an "official" millennial, born 1989. One thing I have noticed (in an anectodical, personal and subjective way) is that my age bracket, especially those I would consider higher on an intelligence/success curve, appear to be so much more closet-nihilist than everyone else around.
What I mean by that is that, while of course we don't really want to see the world burn, we are secretly hoping, in the dark, when no one is watching, for things to always go tits up a bit. Like there is a subconscious fascination to the aesthetics of Nero playing the lire while Rome burns. And upon deep self-reflection that's always a bit unsettling.
I don't know if it's related to the generational trend, or maybe it's just selection bias over the people around me, but I think it's mostly the former rather than the second. Probably stems from the fact that we saw our beloved parents struggle in old age with health and finance, while we live in a more priviliged regime (remember that I mentioned this applies mostly to financially successfully peoples) where money seems more immaterial.
So I guess the author might be onto something about this whole financial nihilism thing.