Ya I'm with you here. Never heard that either and know for a fact the leverevolution works in the older guns.
i have used some of that Hornady ammo in my Winchester M94 and i know it was made in the early 1990's, which is way before Hornady ever started making it.
now Marlin may have changed the follower, but not that i aware of, but if they did, i doubt it was because of the ammo made by Hornady. if i am wrong, please someone post information about it please.
once i thought i was wrong, but i was mistaken!