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.
I am uncertain your exact circumstances of the above story. However I can tell you that there seems to be a divide on how to call a mezuzah kosher lchatchila some sofrim are rushed to call something non-kosher and others have the opinion that they are kosher kist not mehudar. (Seems needs to be explained that means kosher lchatchila and obviously kosher bdieved)
Imagine every time someone goes to a Rav for a Sheila and the Rav will say it's not good. Obviously not because the Rav knows the importance of this matter and would look to make it good to upmost ability. Regarding in safrus there is opinions that hold these mezuzahs are kosher and certain people cannot take that