At the end of the day only you know whether your saddle has the correct height. Adjust it too low or too high and you will feel uncomfortable.
The video is dedicated for how women can approach to adjust a saddle and the Cycling Weekly article is for as well men as women. Apart from the height you also need to consider the horizontal distance compared to the bottom bracket and angling.
The saddle height does matter as you may prevent pain in i.e. your knees and you obtain the maximum performance of your efforts.