Not according to this fellow: "I can't speak for anybody else but the bugs found in the beta copy of Safari on Windows work on the production copy on OSX as well (same code base for alot of stuff). The exploit is robust mostly thanks to the lack of any kind of adanced security features in OSX, "
Quite frankly, David Maynor's reputation vis-a-vis Mac security is in the toilet since he was found to have perpetrated a Hoax video demonstration hack into a Mac laptop at last summer's Black Hat Conference... He and his partner were quoted as saying they "would like to poke a lit cigarette into the eyes of Mac users."
Your quotation's last sentence says a lot... it shows him to be a bitter man.
OSX has been on the market now for six years and there are still ZERO malware or viruses in the wild.