The article actually addresses this: Monitor displays are relatively darker than TV displays. This is because monitors are designed for people who sit up close

The article actually addresses this: Monitor displays are relatively darker than TV displays. This is because monitors are designed for people who sit up close. It may not be a problem when you’re watching a movie in a dark room. If you watch with the windows open during the day, however, your monitor won’t be able to produce enough brightness to give you pleasant viewing experience.