Comment by tedyoung

Yes, but: https://twitter.com/nipafx/status/1676908785313492992

"JDK21 is a version, for which many vendors offer support."

tl;dr: the Java version is not what gets "long-term support", it's a specific runtime JDK released by some Java vendor, e.g., Oracle, Eclipse Adoptium, Azul, Microsoft, Amazon (Coretto), etc.