Unfortunately the Smart TV hacking community is not that active.

It is a bit more active than your links seem to indicate, but is not very well organized or easy to find.

Use cani.rootmy.tv to check recent status of rooting LG TVs models. Many slightly older, 2+ years old TVs are still rootable, due to this exploit from 2024: github.com/throwaway96/dejavuln-autoroot