“yidiishistes and tarbut, cultural Hebrew school. I don’t see Mizrahi mentioned. Did I miss it?”
Yes you did. Those “cultural Hebrew schools” or Bnei Akiva, etc. were all absorbed into Mizrachi. And, sorry to curb your excitement, but by “Yiddishists” he was also referring to Zionists. The faction of them (eg. YIVO) who wanted Yiddish to be the language for the medina.
Thanks for the proof to help the anti-Zionist side. Good to see people bringing sources again.