This is neither bad usage, nor is it slang. It is a particular word from the specialized business vocabulary. As such it makes sense used between people who share the same occupation as they discuss work. "Compute" used in noun form as a contraction of "computing capacity" appears to be one of these words for use by those involved in the specialized business of cloud computing.
Perhaps it was a bad idea to use a specialized term from cloud computing in a article about cloud computing meant to be viewed by a general audience, but that is no reason to get bent out of shape. Even the person who first complained about it, did understand what the author meant by the term.
"Modern country [music]", isn't that an oxymoron?
It only became an oxymoron when you added "[music]."
Sponge Bath wrote "modern country band."
"Experience has proved that some people indeed know everything." -- Russell Baker