Einhorn has already said he doesn't like or understand Amazon at least valuation wise, although I have no idea whether he is short or not. Amazon is not a "scam", but their valuation is grossly excessive and bloated imho. When it peaks--who knows? But when it does peak, the downside will be enormous.
"Meanwhile, Einhorn's attack on Amazon were overtly hostile as he mocked its CEO Bezos, comparing him to Batman. He (Einhorn) said Bezos' statement that no one understood how Amazon makes money should make investors 'very wary'. " This doesn't sound like a bullish opinion.
I don't think it matters while the Fed is printing money in the backdrop of everything: money has to go somewhere: they are blatantly doing what they have been doing for years: try to get a wealth effect no matter what prices are created in stocks so people feel good. Helping Bezos to one hell of a next egg : earnings or no earnings.