Are you sure? Wikipedia[1] seems to indicate it at least got into a beta, but it also implies that the domain was what was reused for the bitcoin exchange, not the code base. That said, the references on wikipedia point to the Internet Archive, which shows a placeholder page that says it's in beta, but there's little there to indicate there was ever anything working. It also says it was used to advertise another card game later, but that was just a link to another domain.

I guess that's a long-winded way of saying you are probably right.

Then again, bitcoins were worth so little in 2010 that I could imagine the account security on exchanges back then being comparable to hobbiest exchange sites, so the spirit of the comment may be valid even if the specific example falls down. :/

1: https://en.wikipedia.org/wiki/Mt._Gox#Founding