Which leaves five possibilities:
1) We are looking at the worlds first balding 45 year old married, white, Belgian parent terrorist.
2) The web page is a complete fake.
3) The posts are fakes (art?)
4) The Hotmail account was hijacked by someone wanting an untraceable relay (skript kiddies do this all the time).
5) The headers to the usenet postings were forged (also fairly easy to do) and this poor sap just happened to be the unlucky fall guy.
In any case, I doubt that Mr. Gobin has anything to do with any terrorist groups.
I dunno about the rest of the headers but I can tell you with all certainity the e-mail address is false. No one uses there e-mail address on usenet unless you want to sign up for 1000 pieces of spam a day.