"...is a scenario in which the density of objects in low Earth orbit (LEO) due to space pollution is high enough that collisions between objects could cause a cascade in which each collision generates space debris that increases the likelihood of further collisions"
So destroying a subset of satellites might create enough debris to cascade-destroy the rest of them. But that would not be limited to SpaceX satellites, and would effectively lock-out human species from accessing space for some time.
"...is a scenario in which the density of objects in low Earth orbit (LEO) due to space pollution is high enough that collisions between objects could cause a cascade in which each collision generates space debris that increases the likelihood of further collisions"
https://en.wikipedia.org/wiki/Kessler_syndrome
So destroying a subset of satellites might create enough debris to cascade-destroy the rest of them. But that would not be limited to SpaceX satellites, and would effectively lock-out human species from accessing space for some time.