Fuck Hasan, but this is wildly decontextualizing what Leftovers was and Ethan's record at the time. Ethan was a shitty racist freak (and Hasan either willfully ignored the depths of it or was incompetent in investigating some of what Ethan posted), but Ethan's obsession with defending Israel wasn't a thing then and Hila was framed as maybe having turned a new leaf after having been drafted to do an office job for the fascist state, and then the point of Leftovers itself was basically Hasan trying to help Ethan become a leftist, presenting him with facts and arguments and so on. During this period, lying or not, Ethan was far, far more conciliatory to more progressive positions than he is now. I think besides not duly accounting for the fact that Ethan posted some really fucked up shit in the past, the premise of the show was minimally understandable because it was, from Hasan's view, oriented toward anti-zionism and progressivism more generally.
And seriously, fuck Hasan, he's a piece of shit who almost never, ever admits he's wrong and constantly punches left as he becomes the living embodiment of socdem brocialism, but I think the way you are characterizing this in particular is misleading at best. Let's attack him for real problems and not that he shocks his dog or did Diddy shit.