Hi! Welcome to the forum
That is a common question that appears in this forum. When the coach says 17kg (without a 2x) it means you have to do it with only With one dumbbell even if the video shows 2.
Dumbell gain journey calculating and informing the weights wrong it seems
In that topic @Ben says it is just like that. For example in the exercise you are showing, you should do something like goblet squats with only one dumbbell of 17kg.
I hope it helps
