YIVO is completely irrelevant. No one uses their fake Yiddish. They make up words that absolutely no one uses.
The secular people who claim to want to revive Yiddish and claim to know how to speak it number only a few hundred. And even they don’t really know Yiddish.
The only true Yiddish speakers today are from the Orthodox Jewish/frum world except a small number of very old Russians who aren’t frum but learnt and spoke Yiddish as their first language as children in Russia. Most of them were born before the Second World War.
Their are about 350,000 Orthodox Jewish Yiddish speakers, of which about 200,000 speak it as their first language and the rest are fluent in Yiddish as their second language.