[BurningFrog]

The article is pretty clear to me.

The main complaint is that the Khan FTC by default is against all mergers and acquisitions.

This is different from the previous standard that only mergers that harm consumers are bad. So now even mergers that benefit consumers are blocked.

[michael1999]

That is an a-historical claim. That standard was THE standard from 1890-1980. The consumer-harm standard was the innovation of Bork under Regan in 1980.