Then we are on the same page here. The question in this case is if the math is mathing. Launch cost is one thing, but just judging by the pdf they fail to adequately address the fact that they will be the first people trying to build a sattelite that is required to dissipate heat by that amount into space.
Don't get me wrong, maybe space datacenters can be more efficient after decades of RND and maybe that RND is even worth it, but if you are the company who wants to convince me to give you money to reach that job you should not go like "cooling in space is free", because there is no such thing as free lunch in space engineering.