I know I'm opening a can of worms here but how can they publicly name the stores that are selling the pasul ones?
The message and point of the video/investigation is clear but why the public shaming?
I am happy he did it. When I was purchasing mezuzahs for myself, not mivtzoim, I was unable to spend too much money. I went to one of the places in the video and ordered one expensive mezuzah and the rest mivtzoim mezuzahs. The salesman tried to dissuade me from buying the cheaper ones. He said they were 100% kosher, l'chatchilah, only that they were cheap and not good quality. In that situation, my plan was to buy the cheap ones and in time replace them with better ones.
The first time I got them checked, they were all pasul. Not kosher b'dieved, not some of them ok, some not. All pasul. I was furious. As much as I was at fault for cheaping out on the mitzvah, and I certainly should have splurged, he did assure me they were 100% kosher l'chatchilah.
The "expensive" mezuzah (~$150 IIRC) was impeccable. It has been checked by 3 different sofrim over the years, and they have not found even the tiniest blemish.