Below his pinned tweet on the Guardian is this tweet from him, mentioning the writer of the opinion piece you link (Aditya Chakrabortty):
> this is the "cred" they built up by publishing people like me, .@OwenJones84, .@GeorgeMonbiot, .@chakrabortty - all of whom I very much respect. They used us so no one would believe they would simply lie to destroy any chance of a left gov't. But that's exactly what they did. - https://twitter.com/davidgraeber/status/1210323190402162704
I actually respect David Graeber a whole lot more than the others he mentions here because he didn't let his access to the Guardian stop him from calling them out. Going as far as to say he wouldn't write for them again.