Possible, but someone would have to be spoofing IP as well, as the address of these posts is apparently from the same ISP & location (and yes, the location fits) as posts from the last week or two.
Yes, I thought the same thing, so I checked, and while I wouldn't rule out IP spoofing or a more elaborate hack, it most certainly is not a case of someone just hacking his board password. So, based on the preponderance of the evidence, that's the man himself.
So mark me down in the "just drank a case of Schlitz and chased it with some Absinthe, so he's temporarily off his rocker" camp for now.
-Arlos-wearing-his-mod-hat