The practices you just described are very pigeonholed: they are within what's common, socially acceptable and expected from a leftist, which is a very narrow and specific frame, much more narrow than what's necessary and more narrow than what's possible.

Here the expansion of the frame of action goes beyond the boundaries prescribed by your political identity and ideology. It's about doing all of those things, but also infiltrating companies, foundations, and the academia to work on both sides if it's useful to generate leverage. It's about building infrastructure, protocols, and systems that scale and can outcooperate the capitalist system. It's about building structures that can surpass in power the existing ones in order to replace their oppressive "power over" with a liberating "power with". It's about sabotaging the old and scaling up the new. What has been tried so far by "leftists", whatever it is, has failed and therefore it was not sufficient nor we have reasons to believe it will be sufficient in the future.

Again, there are plenty of leftists in the boards of companies, foundations, and decision bodies of academia, but they often lack a bigger frame to coordinate their action beyond their direct social structure, especially because they have to operate under cover.

A metaphysical shift, and with it a narrative shift, can enable these actors to recognize each other in a common language, distinct from that of the manichean left but also distinct from who is operating within the old world and with old practices. This is something the current frame doesn't offer, and forces, through a fake duality, that there's an "inside the system" within which change is not possible, and an "outside the system" where change is possible. In reality, there's a single system of power, and no inside or outside: we are complicit. we are all participating in evolving the system. The only difference is if we are contributing to evolve the system in a liberating direction or not.