If the guy told you it is kosher l'chatchila then he stole from you, but when people ask for the cheapest possible mezzuzah, then it is going to be b'dieved (and anyone who didn't know that before now was burying their own head in the sand). The fact that one sofer who checked them said they are passul does not mean that the one who sold them agrees.
Again, I agree that passul mezzuzas being sold and the ones who sell them should answer for their actions, but this video went to far to the other extreme by using a sofer that is more machmir.
I'm just calling for a little bit of nuance.
Firstly he says a second sofer checked them.
See upthread - I 100% was expecting a kosher mezuzah l'chatchilah. I even discussed it with the salesman (who is a sofer) and he made no mention that they would not be 100% kosher.
If you tell me it costs $35, that's what I think it should cost. Don't accuse people of burying their heads in the sand when you're not telling people that if you only spend $35 the mezuzah is not going to be kosher l'chatchila.
Machon Stam charges $42 for their cheapest mezuzahs. (according to their website) They were all kosher, even according to this extremely machmir sofer.
I'm all for nuance. But this is theft. Plain and simple.
ETA: apparently he is not willing to have these mezuzahs checked by independent sofrim. But I stand by claim that they all selling these mezuzahs under false pretenses based on personal experience.