The paper you linked also does not contain the word "Sweden" in it or '90%'. The authors are looking at China, France, Iran, Italy, SK and US. Wonder if there's some other news article on nature.com Disney is referring to rather than the paper you linked?
edit; the paper also says "We adjust existing estimates of case under-reporting to further account for asymptomatic infections assuming an infection-fatality ratio of 0.75%". It says right there, and they have more in the Supplemental section, what their calculated IFR is and run a sensitivity analysis on that assumption. It's explicitly not greater than 1.00%.