The point of the priority system is that it isn't based on what you're doing ("camping") but instead on the actual network conditions.
If Starlink is ranked above 5G, then it'll never fall back to 5G. 5G should be ranked above Starlink, and then when camping and there's no 5G it doesn't matter the ranking.
Starlink is still geofenced to 25 miles IIRC, so his setup should fall back to other options when he leaves that area. I'm still not sure if it makes sense to rank starlink above 5G, though.
If Starlink is ranked above 5G, then it'll never fall back to 5G. 5G should be ranked above Starlink, and then when camping and there's no 5G it doesn't matter the ranking.