I’m not convinced tbh. Some of the stubble hairs are starting to grow now like normal hairs. The rest have probably grown out a tiny bit in general. They couldn’t be called pepper spots anyway because they are longer than just a spot. They look like a day or twos growth after shaving. Whereas the spots are indeed spots, and come out without resistance when squeezed out.
I will be quite surprised if the ‘stubble’ suddenly starts shedding after 4 weeks but will wait and see i guess. They seem to be hairs that were stunned, but not effectively disabled.