No doubt I am oversimplifying things. But are we quibbling. Saudi Arabia is also home to it in its most primitive aspect and Saudi Arabians, like Bin Laden, amongst its principal exponents. My point was that the people who run the country are not to be confused with them. If they were one and the same there would be an official policy for the extermination of all Shia Moslems, even Saudi citizens, since fundamentalist Wahhabism regards non-conforming Moslems as more contemptible than infidels, and clearly they don't do that.
Besides the extremists in Saudi Arabia are a threat to the Royal Family and their mortal enemy. Hardly surprising that "official" Wahhabism looks to distinguish itself from them.
OTOH, note that the Saudis are in no hurry to eliminate ISIS because they are a Sunni bulwark against Shia Iran and therefore they serve their regional interests.