I work with manufacturers in China in a totally different space for a side hustle (computer peripherals, so to be fair, it is very far removed from QSC and co). Two of them have discussed the crackdowns with me and said that they were very heavily focused on opioid side of things. They also spoke to the general cultural mentality in China when it comes to manufacturing things being to basically do whatever the hell you can get away with, and for a long time, you could get away with it.
They've got no specific knowledge, but acted surprised that I wouldn't just have automatically assumed it to be true, because they would in my place.
In the end, I have no proof - and frankly, I also don't care either way - so just voicing that I have my suspicions.