There is nothing about banning Russian language schools. It's about shifting state funding from Russian language to Estonian language. Privately funded Russian schools can keep operating. It's also not out of the blue, this has been talked about for over 30 years now. The latest developments are also still just more talk, no actual action has happened.
As for the culture of coldness, that is true. That also means though that if someone is nice to you, it's genuine. I personally much prefer this truthfulness to the USA style of fake niceness.