It's not "misinformation" that's being disseminated, it's different experiences. Some Campy users have used Shimano (and everyone else's) cables with no problems and others have had the cable ends stick in the brake or shifter recesses. They are reporting what happened to THEM. They are not trying to mislead you.

I expect it's a matter of machining tolerances, cable end tolerances and how much maintainance is done between cable changes. As with a lot of things, YMMV