I read it all, for a certain value of "read". It's very long, and heavy on examples and fascinating facts, but skimps on getting to the point. I enjoyed the line about plant biologists suffering from brain envy. The article gets better from about halfway through as skeptical views begin to be introduced, but eventually it lets go of that and turns back into lot of hand-wavy awe about mycorrhizal networks, and I missed what the "new proposal" is. If it's only saying that intelligence is an emergent property of connections, and could therefore emerge in swarms or societies, we've had that idea since at least Hofstadter and his sentient ant nests.