Earlier quoted context omitted.
Because it’s economics, a social science. Not a physics experiment you can replicate in a lab. You do what a serious person does: look at the thesis, look at the sources, look at the numbers, and do your own analysis
You can't feasibly read all posts about AI in the world and analyse each one individually with the level of care you prescribe. You have to apply some heuristics to decide what to read, and someone being consistently wrong in the past is an effective one.
Very often predictions are useless to evaluate an analysis, you need to look at the underlying assumptions and facts, and see how they reflect reality. Ignore the person, look at the story and decide for yourself if it makes sense or not