Except the post does explicitly refute the claim. Direct quote from the [blog post][1]:

[1]: https://blog.andymasley.com/i/192671089/my-core-claim-this-i...

"My argument here is going to be that this paper is just measuring the fact that buildings are hotter than grass. The land around the data center that isn’t either buildings or road has probably not warmed. It doesn’t matter at all that this study is about data centers. I’d expect similar measurements for Wal Marts. If you build a building, whether it’s a data center or Wal Mart or house or Starbucks, and you point a NASA satellite at the building, you are going to measure a warmer surface temperature exclusively caused by the material the building made of, not any heat exhaust from what’s happening inside the building."

He goes on to get into the math of his claim. It's possible, of course, that his math could be wrong, in which case his refutation would be incorrect. But he very specifically refutes the claim you said he doesn't refute.