It could be that the ambiguity is intentional. Xi probably knew that if he outline every thing clearly, people will just try to find loopholes to exploit like they did in the US. By being ambigous, instead of trying to find loopholes to exploit, businesses are forced to find how to comply. I think crushing the online education sector really terrified a lot of those giants. Nobody can imagine that Xi would have destroyed an industry worth billions just like that. I think the online education is a sacrificial lamb, you know kill the chicken to scare the monkeys.