I see two problems with having a poster named Syd Thrift write a marketing piece for OOTP:
1. Some people might actually think it is a testimonial from the real guy. As ridiculous as it might seem, you ought to put a disclaimer on there or something that indicates the person uses that as his screen name.
2. Those same people will likely not buy a game that they think the real Syd Thrift gives a thumbs up.