I don't think these rules can work for our eyes / brain problems. The first time i've get eyestrain was with a 4K monitor.
I've also had problems with the MBA 2018 and MBP 16" both with high definition display.
In the other hands, i am super happy with the Iphone X and with my TV LG B8 (OLED 5K). I am super fine with the Ipad Air 2 but i couldn't use the Ipad Pro 10.5"
Now i am using a 240hz display and i really like the high refresh rate, i don't want to buy any monitor under 120 hz / 144 hz and MACOS really suck to manage high refresh rate monitors. I couldn't be able to go over than 120 hz even with a 240hz monitor and i had the same bug descripted on that article.