Yes, we've seen this in posts at this board about so many schools, EMPLOYERS.
In the present environment of a "crackdown" as it were, farang teachers are again the targets for any one or more of a variety of reasons. As with your married to a Thai lady friend who WAS legal, we must ask why she isn't presently legal? I think we can believe that she herself has not been withholding documents the school needs to make her and others at the school "legal." If, in this instance, ten teachers aren't legal, there isn't any reason for us to believe that ten teachers are illegal other than because of the dereliction of the school--especially if the teachers began teaching at the school from the usual beginning of the School Year, that is, May.
Your first reports in posts here today, which tho at this point are sketchy but I'm sure are fundamentally reliable, indicate that the school remains untouched by the authorities whilst the teachers are the ones being hammered. We know it's the responsibility of the employer to make all farang and foreign teachers legal. So, why aren't the employers at the police station right now, being called to account by the authorities? Why aren't the EMPLOYERS at the police station handing over the cash (much of which, yes, the police will pocket)?
We need to pursue this central point, no?!?