Starshield has a separate dedicated constellation and can also use the civilian Starlink constellation for certain purposes. This is not a problem. The US government has direct operational control for everything they need. No one of any importance cares about "incidents" on X.

That's valid and definitely changes the risk profile if the military constellation is operationally separate. Though the civilian network is still a force multiplier in many cases, which puts it in the targeting calculus for adversaries regardless of whether troops depend on it directly.