If it's spam, you can report it as such. I'm with DdmrDdmr on this: it shouldn't receive negative feedback.

You could be right on the VPN, and I wouldn't dare touch it myself, but a simple post under his post would have been enough. He might even change which VPN he uses by himself. I'm not convinced it's an alt-account created just to promote the VPN. Let's see if we can turn him into a real Bitcointalk user