Should he have been fired?

This is not a hypothetical abtract musing with insufficient information available to make a judgment. You have access to the site. Look for yourself at the contents of it and give an actual answer, not a text book if-then-else-maybe.

I removed that part after checking it further because of essentialy what you said. but I also changed my mind.
regardless if he's getting paid to write and if it doesn't match the theme of the website. he's paid to give HIS opinion on subjects not the website's opinion. so he should keep his job.