Example: Put a phased array radar in space and you can see everything. Without their operational satellite these things are useless.
This argument was made in the 60's where machines are more capable then humans. It didn't work then and will not work now.
Satellites are not the only way to do things. While the original buzz bombs just used fuel use estimates to get anywhere near their target, there are many ways to navigate that don’t use US controlled GPS.
In fact, because GPS is US controlled, lots of other countries have considered using other guidance systems. LORAN-C, while phased out in the US, still exists, but that is still quite high tech. They could even go a step down from that and just have a three point unmanned ground transponder system, if the UAV had a small calculator on board to plot triangulations at intervals.
And there are many levels below that. They only need the accuracy of a 1000lb bomb.