I have seen it stated
Where?
Does it bloody matter? This isn’t a court of law. He probably doesn’t remember where he read it, guessing that like me he doesn’t exhaustively index and cross-reference every fact in case some irritable sod on the internet jumps down his throat for posting it one day.
General chit chat would be a lot harder if everything had to be referenced, independently verified and scrutinised by the opposition. Perhaps you’re trying to kill off such frivolous activities? Not sure why, this is a forum explicitly for that purpose. Why are you here?
Just amused that the things that he loves so much about English actually come from another language.
Why?
I like eating pasta in a restaurant in Cardiff, but it comes from Italy. Am I allowed to say that without being ridiculed?