I like that he points out hidden suggestion behind word "tankie" that only Western "communists" got the it right, while most other revolutionary movements across the globe got got it wrong.
It comes from a perspective of privilege and ignorance - supposedly we should not support existing revolutionary movements, but sit on our asses and complain about capitalism while condemning every attempt to stop this horrible imperialist machine. Most people who suffer the most would probably not agree with this point of view, but they are ignored.
It seems that these people do not take this into account.