Without me getting into the specific issue, that's false. Languages evolve by how they are used, regardless whether who uses them is native speaker or not. All languages who have been at some time used "universally" in larger regions evolved reflecting that reality.

> foreigners to tell us how we should write things in our own language.

They did that? Where?

I’m also assuming you’re from England, otherwise you’re also a foreigner speaking their language, and likely with considerable difference.