I think calling them cowards is wrong. These people probably are just as spread out on the anti-authority front as any other group. They just appeal to different authorities, and in this case the Gentile Society's authorities were saying that a lab leak is unacceptable belief.

Also at the time, there was huge reactionary responses to Trumpism, BLM was in full fling, and there wasn't much mental space (and time) left for most people to make clear informed decisions. The trustworthy-looking authorities were saying it's not a leak... and wink-wink if you think it is, you're a Trump supporter.

Now that US internal politics is a lot less saturated with crazy stuff, it seems like there's more breathing room for people to sit back and requestion their prior beliefs. And the audience is more receptive, more ready to hear, less occupied with anti-Trumpism.