All this content with seller financing says one of the benefits is that the seller avoids capital gain tax. But basically the seller is just avoiding paying a capital gain tax all at once and is instead paying this in incremental amounts. They are still paying the same amount of capital gain tax. Is this correct?

Is a favorable seller financing structure to have a 30 am with a ballon payment after 5 years? At this 5 year mark, the seller then goes to a bank to get a mortgage after having more equity in the property?