If Jews using something makes it holy, then a nafka bayis used by Jews is holy.
Again, please quote a source for that other than “only deniers will deny that”. Your insistence doesn’t make it true. You need a source.
I do argue on Yiddish being equivalent to French. Rav Yaakov Emden came out strongly against the learning of French instead of lashon kodesh, saying it leads to bad things. It’s mentioned by the Kav Hayashar with the footnotes saying the source.
Even the Stmar Rebbe only said Yiddish is holy because through yiddish Satmar yidden stay separate from the goyim. The German, Polish, Russian, and Hungarian words certainly aren’t holy.
There is holiness in yiddish based on
1. Loshn koidesh verter in Yiddish
2. Expressions based on Torah, like shep nachas (“scoop nachas”, similiar to hseplefl a scoopiong spoon or ladle ) based on the pasuk in koheles about tov melo kaf nachas , a spoon of nachas is better.
But none of that is intrinsic to Yiddish.