He made remarks about scuffing and inadequate lifter body lubrication, which would indeed imply that he didn't know that the lifter bodies were directly oiled. Also, since GM AFM engines experience a similar failure, I don't think we can just chalk it up to lubrication. Most of these engines live long event-free lives, if there was an actual architectural problem, they would ALL fail, which of course they don't.
Originally Posted by Ben99GT
I don't see a debunking. Was the other guy clueless to the lifter oil galley? I find that hard to believe. He had a block in hand, all it takes if a pair of eyes. The only sure way to really debunk the camshaft lobe lack of lubrication would be to put the engine on a Spintron and monitor camshaft oiling behavior in real-time.