How is that not credible?
A Baltimore Sun Op-ed piece by an Israeli Jewish Persian-speaking and Tel Aviv-resident commentator republished by an anti-regime web site in the US. The author is, sort of, a standby guy for US journalists to call on when they need a fast quote about Iran. A simple google search shows that in the last month he has been cited on regional matters by, inter alia, Washington Post, Christian Science Monitor, and, a bit before that, by Haaretz in Israel - not at all complimentary to the Iranian regime. Here is a conclusion from his Haaretz article:
"Meanwhile, as the world's military analysts try to decide if the military point of no return in Iran's nuclear program is two, five or 10 years away, the fact remains that by openly calling for Israel's destruction, Iran crossed the political point of no return in its foreign and nuclear policy. By doing so Tehran must be made to understand that in a post-Rwanda and Darfur world, calls for genocide are not only unacceptable, but they also carry a very hefty price."
Of course, one has to acknowledge, it's not exactly Friedman writing at the the NYTimes and he didn't do a proper poll.