Below are links to both US and Canada Pirelli warranties. The Road Hazard statement for US (identical to Canada) is quoted here:
"Road Hazard Coverage for Run Flat and Pirelli Noise Canceling System (PNCS) Tires
Pirelli Run Flat tires are manufactured with technology that allows limited low-inflation operation in the event of sudden loss of pressure. As a result, in addition to the standard warranty coverage, Pirelli provides road hazard coverage on both Pirelli Original Equipment Tires and Replacement Tires manufactured with Pirelli Run Flat or PNCS technology.
If a Run Flat or PNCS tire becomes unserviceable due to road hazard damage within the first year from the date of purchase, or within the first 2/32" of the original usable tread, whichever occurs first, the Pirelli tire will be replaced with an identical or comparable tire at no charge for the tire to the owner, including mounting and balancing (subject to applicable limitations)."
https://www.pirelli.com/tires/en-us/.../tire-warranty
https://www.pirelli.com/tires/en-ca/.../tire-warranty