Question about JMonkey's WWSD sandwich bread

Hi

Question about the recipe http://www.thefreshloaf.com/handbook/whole-wheat-sourdough-sandwich-bread

It says that it's supposed to be 75% hydration

But when I calculate it, it turns out to be about %.

Am I doing calculations wrong? Should I add more water?

From website:

Whole wheat flour: 500 grams or about 4 cups
Salt: 10 grams or 1.25 tsp
Water:
•    Using a wet starter: 225 grams or 1 cup
Whole wheat Starter: Two options
•    Wet starter (100% hydration) 300 grams or 1 ¼ cup
Honey: 21 grams or 1 Tbs
Unsalted butter: 14 grams or 1 Tbs

So that's 650 g of flour all together (500+150 from starter)

375g of water (225+150)

so that's 58% hydration??

Or does honey and butter factor in so it somehow adds to 75%hydration?

Thanks