The part that strikes me the most is the following: "proponents of IP say that without it we wouldn't have movies and medicine, but we had both for centuries without IP". That's just false.
True, we had art in the Past, but it was a different time: in the Middle Age everything was the King's property, and before him, God's. The critical point is that the business model was different: we relied on rich families to cover the costs. Dante's Commedia was covered by the pockets of the Lords of Ravenna (and the Church). Virgil? Covered by the pockets of Maecenas (and Augustus). Wanna have democracy and equality? Capitalism is the only business model proven capable of sustaining that.
Same goes for medicine, that by the way never reached any meaningful scale before science, IP and capitalism came along.
The author seems less interested in getting the facts right and more interested in pushing forward their political point of view.