The Forward sheds light on Robert Roth's question about which Yiddish accent was used, and why.  They also have interviews with the people who put the Yiddish course together, as well as a "Yiddish Word of the Day" series.

https://forward.com/yiddish/444999/learn-yiddish-with-the-forverts-word-of-the-day-videos/

I thoroughly enjoyed this.  But I agree, it's not quite the accent I remember.  My grandparents spoke the Polish Yiddish dialect.  The other grandparents were from Belarus, but I had far fewer encounters with them, and my grandfather was already dead by the time I had those encounters.

Deb(orah) Cohen Skolnik
now near Asheville, NC, originally from the DC metro area (DC, West Hyattsville MD, Silver Spring, MD)
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SEARCHING:  KISSIN/KISIN (Vitebsk),
LIFSCHITZ/LIFSHITZ/LIPSHITZ (Vitebsk, Belarus),
ZOLOTUSHKIN (Jahotyn/Yagotin, Poltava),
GARBARZ (Mordy, Ostrow/Ostrova), LANDE/LANDY/LONDIN/LUNDIN (Bialystok)