Not managed to take a look at the chip in the LG TV, but I’ve been playing with the TV in satellite mode again, and the whatever the tuner is, it’s pretty good.
Once you turn off Freesat mode on these TVs, you get more menu options including manual tuning.
I scanned Astra 3 on a Zone 2 dish, and the LG easily manages to lock and tune in the very low symbol rate German/Austrian FM radio feeds (12639V 941 DVB-S DeutschlandFunk and 12643V 555 Austrian stations).
I had in my head that these were also on the Germany beam of Astra 3 (or whatever its equivalent is these days) rather than the European wide beam, so I was surprised to lock them so easily.