Can I get a link to that?
If you want to read the original post, there's a cached version linked from RationalWiki's LessWrong page.
Basically, it's not just what RichardKennaway wrote. It's what Richard wrote along with a rational argument that makes it all at least vaguely plausible. (Also depending on how you take the rational argument, ignorance won't necessarily save you.)
AI Box Experiment Update #3
Tuxedage (AI) vs Alexei (GK) - Gatekeeper Victory
Tuxedage (AI) vs Anonymous (GK) - Gatekeeper Victory
I have won a second game of AI box against a gatekeeper who wished to remain Anonymous.
This puts my AI Box Experiment record at 3 wins and 3 losses.