I think that is a myth. The fact that if you take a scope off a rifle it needs to be re zeroed. As long as you do not loosen or move the rings around the scope and place it back it the same place as before. My history is around 20 years of shooting match rifles. None were ever transported with the scope attached, none ever lost zero. Iron sights on the small bore rifles never transported on the rifle and never lost zero. The sights or scopes are attached to the rifle just before a match. 2 AR15s and 1 AR10 I
own, I take the scopes off and put them back on at will. Never lost a zero. Hunting rifles I leave the scopes on them, never tested the zero change. But, if I move the scope in the rings just a little forward or back or side to side the zero does change.
Addition information: When to range today. I had taken a 10-22 apart, put in a different bolt spring and removed scope and action from stock for the work. I returned the scope to same place on the rail. 25 yards shooting CCI mini mag this day, before it was federal HV lead. I was 100% on elevation and 1/2 inch right. Scope is a old Bushnell banner 4x 1 inch tube .22lr scope.