Hindenburg has been pretty upfront about their short position, as has most reporting.

OTOH, short sellers actually have skin in the game, they're putting their money where their mouths are. It's an important mechanism in the public market, which counteracts the existing bias in favor of stock value appreciation on account of shareholders endlessly shilling the stock.

But that's standard, no?

The only organizations that publish equity research are investment banks (which rarely publish negative articles since they want to be part of potential future M&A activity), and hedge funds.

This type of research takes significant time and effort, and almost no one else does this except short selling hedge funds.

Nobody has mentioned they are a short seller? Every article I’ve seen about it mentions it, and Hindenburg themselves are clear about it.

You should certainly take that into account when analyzing their report, but it does not mean they should be disregarded.