[hombre_fatal]

They added the parenthetical "it should be 'shut down'" in an edit.

Originally it was just "Sorry, but pet peeve. Shutdown is not a verb." and I gave them the benefit of the doubt that they weren't just quibbling over a space.

[robbrown451]

True I edited, but the link to "not a verb" is pretty obvious what they are talking about. Nobody is going to make a site to claim that you can't say "shut down" as a verb phrase, that makes no sense.