but their credibility here is below zero.
They - meaning Yaffed? They're not relevant. Yaffed is a whistleblower, who publicized what they see as a problem. Forget about them. The question I'm asking is how would you determine whether or not the issue they raised is considered a problem within the community.
Here's one alleged response to the recently reported "win" in the courts, from the mother's twitter:
"Thank you for everything you're doing on the education front in the chasidish community. We on the inside can't do much unless we want to put our kids in jeopardy..."
The question I'm asking is about methods: What method could you use to determine whether most parents are okay with the no-secular education, or if some/many/most are not okay with it but are afraid to voice their opinion?
And ambiguity in the regulations would be a help if that leeway was in the hands of the community. Currently that leeway is being put in the hands of the local school board, the only entity whose animus to yeshivos (and private schools) can rival YAFFED. In their hands the ambiguity is the problem
I think you're mistaken. What are you referring to? As I read the regulations, there is considerable leeway in the hands of the schools.