Comment by bri3d

This isn’t even true; Starlink can use the local starlink constellation for positioning and the option is available in the customer facing configuration specifically for GPS denied areas (since about two years ago), where it’s been used for ages.

Something else is going on here - perhaps there’s an edge case where Starlink can be made to perform poorly without falling back away from GPS, but I wouldn’t expect this since it’s been “tested” in the most GPS hostile places for quite some time now.