The guy who said that never explained nor have I ever heard of anyone adjusting cam bearing clearance to restrict flow. A cam bearing works the same way as a rod or main bearing. If it has some clearance, it leaks. The amount of volume flowing to a cam bearing is excessive in relation to the load and rpm(half the crank) that the cam sees. That excessive oil is better restricted and sent to the crank.
I have never heard that there are .001 under or over size cam bearings to adjust clearance in a cam bearing, and because of the way cam bearings are installed, you would ruin a set just establishing what is needed. I say bs on that type of restriction imho.
Cam bearings leak huge, that's why people restrict them.
If I am wrong the guy who posted that should explain how it is done.
Not just make a blanket statement and disappear imho.