Smerel, you’re misunderstanding.
Ant zionists, aka the Torah world, were not anti zionist because of perfidy or the stories he told.
We are antizionist because the gedolei Torah were and are, because nationalism is a non jewish ideology grafted onto Judaism.
Perfidy is treated the same as a Christian pastor admitting his role in the Holocaust. We don’t trust zionists, Christians, evolutionists, maskilim, or anyone else who’s not a Torah jew.
However if they admit to something bad that they and their cohorts have done, it is indeed believable, and it underscores their crimes, that even one of their own will admit to it, after feeling guilty of betraying his people.
We have no positive feelings towards the mechalel shabbos kofer that was Ben Hecht, but his writings serve as a testimony from within that accursed, heretical shmad group. Nothing more.