I never read 4chan or many opinions in genral, but I knew all of those points (minus the vitamin D) on my own.
The quote of 'knew a picosecond after he heard' resonated with me, because my intuition - as a laymen - was exactly the same. The moment I heard of the wuhan institute, I basically was pretty sure what had happened. All that followed was disbelief and mild shock about my surroundings not coming to the same conclusions, or lets say suspicions and not hearing the sound of alarm bells.
I lost a lot of faith in the common sense of people through the pandemic.