thirdeye, that article is somewhat true, I have over a lifetime of repairing vehicles found many cases of warped discs (Lateral runout exceeding tolerable limits) from excessive heat.
The heat is not what warps the discs, it's not letting enough cool down time before parking the vehicle, the rotor (disc) when parked at elevated temperatures cool reletively quickly except where the pads are resting over the disc, this causes uneven cooling and warpage.
I have also seen as in the article, deposition of brake pad material on the rotor(s) along with surface hardening which will greatly affect braking performance as well as heat generation .