You have nothing to lose in initiating a warranty claim through Pirelli. I went through the process with Maxxis three times, and once with Panaracer. The Maxxis process is long and at times frustrating, but always resulted in a new tire.
And yes, I would expect that without those small cuts in the outer carcass, you would have a "blister," where the carcass has separated from the belted layer. This happened to my Maxxis tires on several occasions, and it indicates a failure during the molding process.
Mind you, when my last Maxxis was wearing out I reckoned it was too far worn to bother with a warranty once the blisters started multiplying. I rode that tire for 600-700 more miles without issue-- literally carrying a pin stuck to my saddlebag for popping blisters.
I don't know if I would recommend the same, but do know that it is unlikely the tire will just spontaneously, catastrophically fail. In this case, absolutely talk to Pirelli.
__________________
