Excercise your Google-Fu, young padawan. There is plenty of research out there to back that up.
99% wrong.
The biggest affect of the crown on accuracy is in allowing the gas to escape evenly around the bullet as it exits the barrel. Even a slight difference in pressure in one spot will start the beginnings of a wobble as the bullet leaves the barrel. The spin should self stabilize the round, to an extent, but a wobble will be present. This wobble will grow the further the bullet travels downrange, until the wobble overcomes the gyroscopic effect of the spinning bullet, and it begins to tumble. When you see a keyholed rounds in paper, this is usually the cause.
If the crown has a burr that actually protrudes into the pat of the barrel, you aren't going to hit the broadside of a barn. But this is actually far more uncommon than a poorly (unevenly) crowned barrel (and they can come from the factory like this), or one that has become uneven through heavy use or damage. And if you damage the crown in a way that it protrudes, generally speaking a few rounds through will wear off the slight protrusion, and then your back to an uneven crown allowing gas to escape unevenly, which (see above).