It this a typo, or has he been AM for years?

I'm not sure what you mean by "AM", but I don't think any of the information you see is incorrect. The monk is still Level 1 because Experience=18. This is the monk's XP, which is less than 20. Refer to Voting/Experience System. The monk has no writeups, which means there has been no opportunity to collect upvotes. The monk also probably never votes on any nodes and visits the site infrequently. In other words, the monk does none of the things which would lead to increasing XP.