Cams/lifters do get "splashed lubed." Not only from the crankshaft, but, also what runs off from the cam bearings and what drains from above, sometimes.
I had seen this problem once before on a friend's car. IMO, it appeared the lifters were of "soft" material. They were not treated to the same hardening treatment the camshaft was subjected too. Thus, the cam wore a hole into the lifter.
Check to see the cam lobe(s) is(are) not damaged by this action. If they are not damged, you might get away with replacing the lifters with better quality, GM IMO, and be on the road again.
If camshaft is damaged, then a replacement of all is warrantied.
I would think you would have a hard time getting a replacement from the camshaft manufacturer, even if you bought it as a cam kit.
Also, another characteristic of this problem is too much spring pressure. Goes along with the "deluxe" cam kit, cam, lifters, springs, retainers, and pushrods.
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