That's probably a misconception based on the new Oracle JDK release and support cycles; new release every 6 months, at which point support for the -1 version is immediately stopped (unless you have a commercial license or something). This LTS version is probably different (hence the name LTS), but it's also commercial.

Anyway it's a misconception because it only applies to the Oracle JDK, OpenJDK still follows a different support structure I believe.