I'll avoid trying to guess what the author meant, but I found it rather relatable. Some of these "rockstars" pick weird languages, niche database, esoteric frameworks and whatnot, not because they're needed, but because that's the rockstar thing to do at that moment. And then they leave and you're stuck managing a Cassandra database and a Rust application when everything else around you is MariaDB and Java, and you have to maintain an application in an abandoned JavaScript framework, even though dynamic frontend wasn't a requirement.