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the_dunk_tank
It's the dunk tank.
This is where you come to post big-brained hot takes by chuds, libs, or even fellow leftists, and tear them to itty-bitty pieces with precision dunkstrikes.
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Can anyone explain the revisionist thing for a non american who's not familiar with revisionism in socialist parties?
In this context they're saying the philosophy of PSL is a revised form of Marxism(-Leninism, probably). With negative implications.
S4A is anti-China, they are an Ultra. In the video they elaborate on their statement here (that I watched out of morbid curiosity) and they accuse PSL of being revisionists for being Dengists.
If PSL is anything, it's Maoist, and they seemed to have leaned a bit on the ultra side when they first started the party, but I believe they have improved since then.
One of their old articles on China is somewhat ultra and idealist: https://www.liberationschool.org/what-do-socialists-defend-in-china-today/
I mentioned this article here where I was able to get outside perspectives.