Scott Manley's video uses 20kw as a reference number which isn't even half of the power usage of a modern GB200 rack. I.e. not even close to the power usage of an actual datacenter. In fact, not even 1% of the power usage of a datacenter...

Also, how is a constellation of satellites any easier in this case? They all need extremely large radiators, they all need maintenance, they all need high bandwidth communication.

If you calculate the actual cooling requirements for megawatts of server, you end up with needing many, many football fields of cooling.

It's nonsensical. Sure you can make the numbers sort of work for a single server, but a single server on earth costs MUCH MUCH less to launch, maintain, etc. So why bother doing it in space? We just end up with loads of unusable space servers as they gradually breakdown and cannot be repaired.