That article is basically right, but the whole Marvel/Netflix thing was a lot more snarled up than just Netflix's business model of paying more for shows but also keeping more of the ownership. Like the article stated, that meant the shows started off on a more even financial basis, but didn't make as much money for the outside studio. But that happened before Netflix -- a lot of Canadian scifi TV shows, like Continuum, Dark Matter, and IIRC 12 Monkeys and Orphan Black, had similar models and financial difficulties. It's going to continue to be a problem as long as the outside studios want the profits but also don't want to take the risk on paying a lot of money for properties they aren't going to be able to own long-term, and that was a problem before Netflix.
Marvel was cutting ties with Netflix anyway -- Infinity War is the last MCU movie Netflix is going to stream, and Marvel already is setting up two or three short-term Disney+ channel series based on popular (but not that highly paid!) movie characters. The author doesn't seem to know that the Marvel shows also all had the two-year blackout before they could be picked up by a different network, so no, there was no way any of them could be moved to Disney+ anyway. And "Netflix has built an adequate Marvel library, which will live on the service" -- nooo, all the future Marvel movies will be on Disney streaming, as well as the Disney movies. It's unclear how long Marvel movies before CM will be available on Netflix, but when the news came out about the move, most industry sites were still saying "But they still have all the Marvel shows." No, the writing was on the wall for them too, although there were creative difference type problems as well (the Jessica Jones showrunner was leaving after 3 seasons, the Luke Cage showrunner disagreed about the plot as well as Netflix wanting to trim the second season from 13 to 10 episodes, and Daredevil and Iron Fist both had different showrunners for every single season, which is a bad sign of creative instability).
tl;dr The cancellation of all the Marvel shows pretty much at once was driven by giant companies waged in profit wars, but not really in the way the author sets up.
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Marvel was cutting ties with Netflix anyway -- Infinity War is the last MCU movie Netflix is going to stream, and Marvel already is setting up two or three short-term Disney+ channel series based on popular (but not that highly paid!) movie characters. The author doesn't seem to know that the Marvel shows also all had the two-year blackout before they could be picked up by a different network, so no, there was no way any of them could be moved to Disney+ anyway. And "Netflix has built an adequate Marvel library, which will live on the service" -- nooo, all the future Marvel movies will be on Disney streaming, as well as the Disney movies. It's unclear how long Marvel movies before CM will be available on Netflix, but when the news came out about the move, most industry sites were still saying "But they still have all the Marvel shows." No, the writing was on the wall for them too, although there were creative difference type problems as well (the Jessica Jones showrunner was leaving after 3 seasons, the Luke Cage showrunner disagreed about the plot as well as Netflix wanting to trim the second season from 13 to 10 episodes, and Daredevil and Iron Fist both had different showrunners for every single season, which is a bad sign of creative instability).
tl;dr The cancellation of all the Marvel shows pretty much at once was driven by giant companies waged in profit wars, but not really in the way the author sets up.