Anyone who posts on StormFront (let alone a five-figure post count) is beyond help.
Very succinctly put.
I have to say that I disagree. My ideological past isn't exactly secret on here. I used to post on Stormfront (although, certainly nowhere near 10,000 posts and only for a brief period of time), so I certainly don't believe that simply because someone posts on Stormfront then they're beyond redemption. There are even former Aryan Nation, KKK, and other assorted White Supremacists who were quite committed to their ideology, including tattoos, rituals, and demonstrations of violence, who've been redeemed.
Whether or not Matthew27 can be is an interesting question and, without knowing him better, is impossible for anyone to truly answer. So, while I'm not in favor of him being immediately banned, I do believe he should be closely monitored and subject to more rigorous scrutiny by the moderators than ordinary posters.