[jameslk]

It’s a non sequitur, like saying “Nobody goes there anymore. It's too crowded.”

I’m guessing the author meant it tongue in cheek but really meant “everyone I know or follow knows it’s a bubble”

[AnimalMuppet]

No, it can still be a bubble when everybody knows it's a bubble. If the price is still going up, I may know it's a bubble, and still not get out, because I'm still making money. But it's a hair-trigger thing, where everybody gets more and more ready to run for the exits at the first sign of trouble.