I know there are rumors floating all over the place about a new ATV coming but even if it does drop soon you can still use the current ATV4K on a non 4K tv to play 4K videos at 1080p and they look fine! The faster processor really makes a difference.
The way Apple has been hampered by the current situation I’d not be surprised if it’s not still several months out. I could be wrong but that’s just my guess.
As a band aide fix you can setup a plex or emby server and install the client apps from the LG App Store. This will get you the 4K playback until you can invest in a new Apple TV.
Im trying that right now, Emby that is.
However, I cant seem to login on my LG and it wont accept IP number for the server, but on iOS it works.
But… I’ll figure it out hopefully.