You know what would happen IF you actually managed to stimulate a c-fiber running from, say, a nociceptor that detects heat? The "stimulation" would eventually reach a neuron inside of your head that would translate that "stimulation" into PAIN due to getting burned. In other words, stimulating c-fibers would CAUSE pain!
Moreover, neither CTTC nor MISTER Marineo has never offered one IOTA of evidence that calmare can stimulate ANY fibers in ANY way different than a TENS. The REASON they haven't is SIMPLY because they CAN'T since a calmare is NOTHING but a TENS.
On top of that, it's not even a good TENS! The only thing the therapist can do is crank the current up and down -- he can't change the frequency or anything else. And the current the thing uses when it is allegedly SUPPOSED to be working is so small that it qualifies as "homeopathic."