the comment left by Eliezer doesn't seem like something that would be written by a smart person who is trying to suppress information. I seriously doubt that EY didn't know about Streisand effect.

No worries about being wrong. But I definitely think you're overestimating Eliezer, and humanity in general. Thinking that calling someone an idiot for doing something stupid, and then deleting their post, would cause a massive blow up of epic proportions, is sometng you can really only predict in hindsight.