Don't be fooled. This account just seems to be spam. He is promoting his website using the signature feature. And just posts seemingly authentic posts here and there.
A shrude and effective way to sneak under the "radar" of forum admins, instead of just posting links.
Sadly I have been seeing this tactic used more and more often in other forums I am using.
In gaming forums you see them introduce themselves "Hi everyone, this seems like a great community! Looking forward in playing and learning from you all!" only to have a "buy computers here" in their signature.