I read through that entire website. There were no lies that I saw, though some of the source material was definitely questionable (and there may have been some exaggerations that give false implications). It makes most of the legitimate arguments against Zionism that exist, and it does not read as if it’s based on hatred but rather on an honest extreme anti-Zionist stance.
The problem is that it’s fighting an argument that’s already over. There are no pre-WWII Zionists anymore. The question now is whether one supports the current Medinah and how much. So whoever was right about the pre-WWII argument (and denying that major Torah figures supported the foundation of the Medinah is just denying reality), it doesn’t matter. It’s over. All using the term “Zionist” does nowadays is breed hatred about an argument that’s not at all relevant. It’s a meaningless term because the Nationalism-based movement of the 1880s-1940s is over. That’s not what someone who refers to themselves as a “Zionist” today means. So why foist a hate-filled term on someone when the pejorative meaning of the term doesn’t apply to them? (Ironically, what is done in referring to “Zionists” is the same thing that I’ve seen people here claim that anti-Chareidim do to Chareidim.)