First, the hard truth: Version 04.06.75 is not webOS 22 or 23. It is a stability and security patch built on the classic "ribbon" launcher at the bottom of the screen.
For TVs running 04.06.75, LG has likely stopped major feature development. You will probably get (if that) before being moved to a “critical updates only” cycle.
Ironically, version 04.06.75 is the last webOS build that still supports the from the good old days. Newer LG TVs force you into a cluttered home screen with sponsored content. On 04.06.75, you still get the clean, single-row dock.