My thought on the CDC is that the SteriPen may not kill the cysts. Basic science, there are cysts (kind of like the microbe version of a spore) and then there's the active microbe. So, killing Crypto would technically be correct, if it's killing the active, mobile form. Leaving the cysts un-treated would thus cause both Steripen's claims and the CDC's claims to be technically correct.

Of course, that still leaves the cysts to wake up in your gut and give you diarrhea.