Utterly retarded, like most of Kurzgesagt's videos.
Exercise does contribute to weight loss, provably so. It's indisputable.
Weight loss all stems on if you are in a caloric deficit. Say you are eating a daily diet with a -500 calorie deficit, based on your TDEE.
Now lets say you work out in the gym + go for a walk/run, and this adds up to 2-3 hours of work. You would burn 300-500 calories, depending on intensity and heart rate.
This doesn't cause weight loss? RETARD.
Sleeping more? LOL
Have you never been on a training regimen for an extended period of time? The point is that you work out consistently, every day, with some rest days here and there. There's no possible way for your body to prevent the weight loss....
Anyone who denies that calorie deficit + working out = weight loss, is FAT.