I guess he's upset not by the existence of school but by the mandatory nature of it.
It's a relatively recent thing, starting 2018 [1]. The official explanation is reducing inequality, making sure rich and poor kids all actually get the same education and not a mere possibility to get it. Unofficial explanations often revolve around integration of immigrants with culture gaps getting too big to bridge by the age of 7.
wtf... let the kids be kids. this is totally gross and government violation of families