If X perpetuates a lie and doesn’t have the facilitation to allow a variety of perspectives and opinions to hold the lie accountable, that is an echo chamber and I’d agree it would be a huge problem. Elon said every person should be allowed to speak for the most part on X. If that saying holds any merit, I assume X lives up to that eventually. If it doesn’t I’m on you guys’ side about X.
I feel if Elon Musk said covid was a lie and people took only his word for it, that is on them. Its another story entirely if there was no other trustworthy source of information or data. USA seems to struggle with that these days, so I understand how it went so wrong with Covid in some places. But yeah, a person in this case would win the game of natural selection by not only going off of what one dude/source says (probably in a casual, low effort manner at that).