I'm not sure how quite to word this.
You saying "he could theoretically stream off his laptop" is no different than saying a luddite could "theoretically sew clothes with needle and thread". It really comes across like a lack of respect for the argument Marxists make. I'm not asking you to be a Marxist but if you aren't willing to engage the argument seriously, I'm not sure what I can say.
Even your "solution", is exactly what the early Marxists thought. They needed to coordindate to overcome the sole power of factory owners and they did that through striking. What is striking, if not coordinated market power? The rest of your post comes off as Marxism, but in a different font. It's as wishy-washy as the solutions proposed by the Marxists on Bluesky. "if only we would come together and coordinate, the revolution will be here soon!".
The issue with "No problems but coordination problems", is that today, in our society, capital solves coordination problems. And before that was monarchy, and before that was religion. The entirety of human civilization can be distilled with "how do we get n-million people to do x?"
I don't consider myself as a Marxist but the actual problems he highlights are very salient even if his followers have failed to solve them. Just because there's no found solution for P=NP, doesn't mean the entire field of computational complexity is a wash.