yeah, no it’s not. That is a fact.
What happens to body fat when you exercise?
Your muscles first burn through stored glycogen for energy. “After about 30 to 60 minutes of aerobic exercise, your body starts burning mainly fat,” says Dr. Burguera. (If you’re exercising moderately, this takes about an hour.)
https://health.clevelandclinic.org/where-does-body-fat-go-when-you-lose-weight/