Indeed the term "warped" gets misused in most contexts, including for our cars where we have this issue come up in multiple threads. Like described already, the rotors may have indeed become subject to defects, but not because they're warped. It's more likely pad deposits and abrasion/embedding. That would create inconsistency in rotor thickness, but not necessarily warped.
It's not like the caliper outright wrangled the rotor at some point, and it's unlikely you subjected rotor to a temperature that starts to make it deform — pretty select circumstances. I'm pretty sure people can do multiple track days just fine on the same rotors.
Culprit seems to be the OEM pads and how they handle with wear and heat. I've been in the same braking situations using OEM and Centric Posi Quiets (which are still a street pad). The latter has put up with more....sessions and still no vibration.
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