You should reread that thread. Laskern is closer. The argument there was NOT (As was pointed out numerous times) that it is holy because it was “spoken by Jews”
So I went back to that thread and here is some of what I found.
JosephParticipant
Yiddish is holy by virtue of it being the primary and exclusive language of Jews for over a thousand years. Even if it is our chol language.
And some guy with a screen name ubiquitin wrote the following gem
“Yiddish was the Jewish language for about 1000 years (give or take depending on your source) . That makes it special? sacred? important? How can it not sure it wasnt used exclusivly used for “holy” talk but it was used by holy people, were all of them frum as some posters claim others are claiming, of course not, but as a group it was spoken by the am hanivchar, it is unquestionably a Jewish language, the jews being a holy people, we have consecrated it making it holy (or scared/important/special since I’m not clear on what exactly holy means.”
Maybe I have difficulty with the holy English language, (which as I pointed out before was clearly spoken by jews before their expulsion from England in 1290 making English an older Jewish language than Yiddish which oldest inscription is from a German machzor circa 1300’s ) but to me it seems pretty clear that these two posters at least, namely a Joseph and a Mr ubiquitin are certainly utilizing The idea that the fact that it has been used by jews for a long long time, infuses it with holiness? Speciality? Sacredness? Importance?