It is not true, currently I'm maintaining a desktop app which is shipped to 3 different platforms and 3 architectures (x86, x86-64, arm64) and runs various versions of JRE (from jre8 to jre22). Most (90%) of the libraries are fully compatible, only some are using latest features such as virtual threads, but it is easy to avoid.
It also seems Rich Hickey kind of stopped doing interesting talks, and some big bank bought into it and no one really likes banks.