Correct. Lunaris v2.3 is created in 6.7.1 delibrerately, so Kontakt 7 is not required. It's also compatible with the Kontakt Player for the same version.Fortunately, Lunaris still continues to run in K6, which is great! Don't know why NA seems to think K7 is required.
However, this compatibility won't last indefinitely, unfortunately. Eventually, Lunaris 2 will need to move into the 7.x range, in particular in order to achieve NKS 2 compatibility. In fact, the only reason that prevents me to upgrade Lunaris 2 to NKS 2, is because I like the idea of Lunaris 2 still being compatible with Kontakt 6.x.