You are assuming that this is based on a 1LR treatment, but he was speaking as far as his recommendation for reaching a goal of a comfortable level that reduced hearing loss and tinnitus. This would be a 2LR treatment. Again, this isn't a super effective treatment. John had treated both ears. It would take double the amount of time, work, and resources (therefore more money) for Draper to have a result that is as impactful.
If I was selling a product that took many hours of my time, and I had someone I had to monitor lying down in a room taking up space, giving a double of the same amount of work and time for free would be a very foolish business module.
And no, him being in normal range doesn't matter. 25 dB is still quite a lot of damage, and can still affect someone's response to surroundings. Since the treatments aren't super effective, it would take a lot more work, and the goal would be to get it to as close to 10 dB or 0 dB as possible.