They also dissed Fyre festival, We Work and basically all of the frauds in the last ten years. Would I use them as my only source? Of course not, but they're definitely useful and (importantly for my point), in the professional finance space.
FWIW, I personally think they're correct on both bitcoin and Tesla, but apparently people disagree.
As the saying goes, "the market can remain irrational longer than you can remain solvent." I hope the next fad is to invest in boring companies that employ people and give steady returns, and they can stop replacing all the stores in my city with Dollar Trees.