Sediment Buster on a hot water tank that I have never flushed.

I have lived in my house 6 years and I have never drained my hot water tank. I decided to do it with this product called Sediment Buster that lets you shoot air into your tank to help stir up the sediment. This video shows how it went. Link to product that I purchased - https://a.co/d/g7q6ESs