Then the targets become the launch pads. Those space-based datacenters will need constant resupply and maintenance. Destroy launch capability, and their orbits will decay and all that computing capacity will burn up in the atmosphere.

We are so so so far away from self-sustaining machinery in space that it's not even funny.

There is no such thing as a self-sufficient version of any industry in space, and you should expect this to remain the case for approximately the next 10,000 years. Until then, everything that happens in space will have a supply chain rooted on Earth.