if you needed a reason to exit this subculture, here are several dozen including the cult of genius, ingroup-overtrust, insularity, out-of-touchness, lack of rigor, and lack of sharp culture that exists in the current environments.
timestamps are included so that you can skip around each video topic.
finally, there are 34 references in the description. I would have included more but this exceeded the character limit.
By this criterion, absolutely no one should be using LessWrong as a vehicle for learning. The Malcolm Gladwell reader you proposed might have been a comparable misinformation vehicle, in, say, 2011, but as of 2022 LessWrong is by a chasmic margin worse about this. It's debatable whether the average LessWrong user even reads what they're talking about anymore.
I can name a real-life example: in a local discord of about 100 people, Aella argued that the MBTI is better understood holistically under the framework of Jungian psychology, and that looking at the validity of each subtest (e.g. "E/I", "N/S", ""T/F", "J/P") is wrongly reductive. This is not just incorrect, it is the opposite of true; it fundamentally misunderstands what psychometric validity even is. I wrote a fairly long correction of this, but I am not sure anyone bothered to read it — most people will take what community leaders say at face value, because the mission statement of the ingroup of LessWrong is "people who are rational" and the thinking goes that someone who is rational, surely, would have taken care of this. (This was not at all the case.)
I don't think further examples will help, but they are abundant throughout this sphere; there is a reason I spent 30 minutes of that audio debunking the pseudoscientific and even quasi-mystical beliefs common to Alexander Kruel's sphere of influence.