There's not much to go on in this post. Has he even asked Tumblr for an explanation? Perhaps someone from Pitchfork Media asked for the password, claiming they

There's not much to go on in this post. Has he even asked Tumblr for an explanation? Perhaps someone from Pitchfork Media asked for the password, claiming they had lost the original email account, hoping that the domain was abandoned? That would still call for an apology, but isn't half as bad as what it's made out to be. Also, claiming that your subdomain was renamed and claiming that your original posts are still on the unrenamed domain is inconsistent at best.