If he says something, in such a delicate scenario as in Russia, and as President of Israel, he intends something. If he indeed said that Israel won't attack the Iranian nuclear sites, then it is an intended message. One has to understand the context, the timing to be able to judge what he said and why. In my estimation, he probably played the "diplomatic cop" thus triggering others to play "the military cop" and nurture the political willingness to cofront Iran, which is currently close to zero.
Woman wounded by stones thrown toward her car near Jerusalem (Haaretz)
from the article: Barak tells Gates: All Iran options still on table