The tank man video has been available for a very long time, liberals just never actually watched it. They just got shown short clips and then got told a narrative about how he was fighting a tank and lost.

This is how capitalist propaganda works. The propagandized don't even realize it's happening. They just hear a narrative and internalize it, with the propagandists knowing the targets will never actually investigate the veracity. He'll, they know that a ton of their targets will even reflexively defend the propaganda line and attack those who did end up questioning it and investigating!

Every person you see calling someone else a Russian not is doing this, for example.