That seems pretty outdated information, given that the OOTH default Retina scaling in MacBooks have been non-2x fractional since 2016 (1400x900 for the 13-inch'

That seems pretty outdated information, given that the OOTH default Retina scaling in MacBooks have been non-2x fractional since 2016 (1400x900 for the 13-inch's 2560×1600, 1680×1050 for the 15-inch 2800x1800).