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Doing this standing workout consistently will reduce stomach fat and improve your overall fitness.
The best thing about this workout is it targets different muscles at the same time and it mainly targets the big muscle groups. Targeting these muscles makes it easier for you to reduce stomach fat.
Instead of doing thousands of sit ups, simply focus on doing these fat burning exercises regularly.
I may also note that standing exercises help you burn fat faster than floor exercises.
Since this is a 15 minute workout, you don't have to make major changes in your schedule to do the standing workout. You can do it without changing your schedule at all.
Enjoy the 15 minute standing workout to reduece stomach fat.