Haven't read the page but a promising-looking search result is here: https://seantrott.substack.com/p/perceptrons-xor-and-the-fir...
I'm sure it's an oversimplification to blame the entire 1970s AI winter on Minsky, considering they couldn't have gotten much further than the proof-of-concept stage due to lack of hardware. But his voice was a loud, widely-respected one in academia, and it did have a negative effect on the field.
I suspect all Minsky did was reinforce what many people were already thinking. I experimented with neural nets in the late 80s and they seemed super interesting, but also very limited. My sense at the time was that the general thinking was, they might be useful if you could approach the number of neurons and connections in the human brain, but that seemed like a very far off, effectively impossible goal at the time.