Hey fellow fixed gear riders--

Long story short, 3 months ago I swapped a SOMA cog for an EAI onto my Pista Via Condotti. A few nights ago while skidding my cog slipped about a quarter turn backwards into my lockring. I walked the bike home and when I popped the wheel off I noticed shards of metal sticking out from under the lock ring. Like it had been through a steel lathe. No bueno.

The threads on inner stepped hub (for the lock ring) are gone. As in, seriously stripped. The lockring will just spin endlessly against the cog.

I did some googling and Phil Wood recommends against using EAI cogs for this reason; apparently there are ~1.25 more turns in an EAI cog than others, meaning that the fatter cog can't get properly seated in the thread. With enough force I suppose it backs itself out, punches into the lockring, and because the lockring spins the opposite direction, it just pushes the lock ring out and takes the threads with it.

So the hub is done for. It definitely needs to be replaced. I'm wondering if anyone has any experience with EAI cogs on Pistas doing this (I didn't see anything), and further if Bianchi is at all helpful (bike's still under warranty, I believe) or if I'm SOL.
All the parts were correctly installed and torqued. I haven't found any warnings from Bianchi about this issue.

Thanks.