Are coperatives the ultimate redpill?

Can you enlighten me on what indicative planning is?

This video misses the most important benefit of cooperatives. Enterprises do not inhabit a sterile economic sphere. They are entities with political significance as well. If serious socialist reforms are ever proposed through the political system, or if workers wish to force such measures through a labor movement, traditional corporations will defend the rights of the owning class above anything else. They will try to get their assets out of there as quickly as possible, thereby sabotage the enterprises and bring economic ruin to the arising socialist society. Worker cooperatives will have much less of a problem going along. While they do maintain the worker-owner distinction by virtue of taking part in the capitalist system, this alienation isn't embodied in different persons. It is united in the worker-owners of the enterprise. A transition into socialism is nothing but the transition from one economic interest of the individual (to extract surplus value) to another of his interests (to hold direct agency over his labor).
What people often miss when discussing worker cooperatives is that they do not have to be isolated. Instead you should think of them as being part of a broader cooperative movement. This movement will have its own channels of communication, and through them be able to act as a united front against mere capitalist interests and for the direct fulfillment of worker's desires.
We simply need to reach a certain critical mass in the cooperative movement for this to become possible.

Of course it will be resisted as being cartel conspiracy by capitalist interests, but this can be countered by scientifically demonstrating clear economic benefits from more integrated cooperation, or simply by asserting the egoist desire of the population to see things organized this way. That's one way we could transition into socialism.
To make the change from commodity exchange to a labor voucher system we should engage in a politics of decommodification. Goods ought to one by one be considered inappropriate for the commodity form, and transition into direct planning. Labor vouchers then present themselves as the logical distributional mechanism.

Another challenge might be the atomization of worker cooperatives. To overcome this problem we should spend considerable attention developing a praxis that reconnects artificially divided interests within a single network. My impression is that such work would already be useful right this moment. There are plenty of local cooperatives and other spontaneous initiatives that have no idea that they are part of a larger economic body. We should spend attention making them aware of each other and integrating them in a single digital network. Next to this, we should simply try to ensure close ties between worker cooperatives as they are founded. Something that would definitely be good is a mutual fund to create new worker enterprises. It wouldn't be difficult to convince the government to help us out in that. Cooperatives are nice and cuddly.

en.wikipedia.org/wiki/Indicative_planning

Whoa now you've gotta elaborate on hot takes my pal

Oh, so effectively Dirigisme.

Maybe it would be a form of micro-indicative planning. Instead of applying indicative measures onto an economic system (subsidies, grants, taxes, and so on), they are applied on each enterprise individually by all other enterprises. This would take the form of directly rewarding the workers of enterprises that perform well (according to whatever metric) with more material benefits, social encouragement and opportunities to reproduce their methods.

Tbh the transition from capitalism to socialism should include a mutualist/marksoc stage.

I agree with this but there's nothing specifically mutualist/marksoc about this. State planning plus coops is already socialism. This would be more like the transition from socialism to full communism.

Whenever a cooperative gets large enough it becomes a corporation.
en.wikipedia.org/wiki/Demutualization

If there are significant sections of the economy run by coops rather than by fully socialized planning then it isn’t socialism. A coop is still privately owned after all, just by a group of workers rather than a group of porkies. They also operate for profit and produce commodities. They’re a definite improvement over capitalism but they aren’t quite socialism either.