Pretty much. There isn't really question could you build satellite with GPUs at certain scale and launch it to space. It is certainly already doable. No special unsolved engineering challenges when you have say dozen or hundred...

Now if we are talking about thousands or millions you have some real questions. Well cost was question to start with. But at millions satellites yeah there is clear issues.

Simple rule for numbers 1 gigawatt is 1 000 megawatts or 1 000 000 kilowatts... So math is pretty simple there in estimations.