Arguably it’s really only an English word once it deviates from the original spelling and meaning. Like how the original British English “Aluminum” is now the American English word for the metal represented by the newer British English “Aluminium”, all of which borrowed from, but didn’t outright steal, the Latin roots.

English has not been in its final form forever, therefore there was a language or languages that preceded it. English words derive from one of these previous languages. Since a word from another language cannot be an English word, English does in fact not have any English words except ones that sprang arbitrarily out of nowhere.

I’m enjoying the schadenfreude (note, the English word, not the German one) of watching this thread unspool.