This HAS happened... but primarily in conjunction with pre-cats which are a catayltic converter attached to the exhaust manifold (built in) I've heard of it quite a few times...
Reason being is they are much closer to the exhaust ports on the block so they could more easily get particles sucked in by back pressure.
If they are warrantying it, then I wouldn't even bother arguing (but don't let them toss your cats). If they claim it is not going to be covered, then remove the cats and inspect them.
2009s and early 2010s are notorious for consumption issues so I wouldn't be surprised if they tried to pass the blame off.
My thought would be that if your cat material blew on your car long enough to cause damage and show noticeable oil consumption, you would also see increased emmisions or at the least, a strange exhaust note.
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