I suspect the addition of twitter to the proposal was purely to ensure it recieved the attention it's now getting.

Also, primary school is equivalent to elementary school is in the states, so this doesn't mean that pupils will never be taught about some of things that have been made non-compulsory. In particular, as the article points out, the second world war is covered extensively during secondary school (i.e. high school). And it's also worth mentioning that this probably only applies to the english curriculum.