So why was Leon497 banned? (Not that I want him back)

I was planning on pulling together some examples of his high-quality idiocy on pretty much all available topics for a Pit thread, and he turns up BANNED. Sock?

(Wow, looking at his post history he even came up as an anti-vaxxer.)

From the FAQ:

http://boards.straightdope.com/sdmb/showthread.php?p=9034110#post9034110

In cases of long-term legitimate posters who are banned, we will post an announcement. If you do not see an announcement, please e-mail a moderator; in most cases, the above categories will apply.