I don't think he'll ask you to remove it, that's the point- he's a super nice guy. So it just seems shady to use this forum to say "hey guys, come join this other forum" even as you use this site's bandwidth to send private messages, etc. That stuff ain't free.
I'm not saying it's a world-ending big deal, it just might be a little dicey. That's all. I don't speak for JavaPF, this is just my opinion.