The tutorials are using Mosti instructions with a few general recommendations. They use a yeast starter procedure (rehydrate yeast) while Winexpert uses a sprinkle on top approach. It is generally recommended that you follow the instructions of the manufacturer- in this case Winexpert. With that being said, you can certainly rehydrate the yeast as in the video and in fact in some cases with cooler temps, you almost need to to get the fermentation going.
Good luck with your kit and enjoy the process of making your own.