Nowhere did he mention salary levels. The main reason we work is to make money, if worker cooperatives makes you less money then that would be the biggest reason to not join one. I really doubt there are many cooperatives paying more than FAANG, so why not just join one of those instead?
In tech though, money is not the main unique value proposition and I would suggest getting curious about investing in happiness[1] so one can increase it's baselines[2]
[1] https://www.youtube.com/watch?v=iNZk-N6uDcg [2] https://www.youtube.com/watch?v=LTGGyQS1fZE