First off, I kinda wonder about a first post link to a sales site.
Very spammy.
As to the e-book, I wouldn't touch it.
It's overpriced, especially for an e-book, and who knows who created the recipes. If you want a reliable, tested, reviewed source of copycat recipes, go to
TopSecretRecipes.com Todd Wilbur is very good at crafting quality copies of chain food.
His books have the Olive Garden and Red-Lobster recipes you're looking for.
But as for the Red lobster biscuits, it's just the Bisquick biscuit mix recipe with about a cup of grated cheddar cheese added during mixing, then brushed with garlic butter when they're done.