150 + activities is quite an exaggeration. I'd say it's closer to 30-50 activities with variations on a theme.
An entire chapter is devoted to slimes, another chapter (40 pages) is devoted to doughs.
Chapter 5: "Small worlds" is a good example of one activity with different themes. And some of those themes aren't that varied, ex.Dragon World vs Medieval Dragon World.
In the first chapter, the author discusses how she makes "taste-safe" materials that allow mouthing children to explore materials, and that "those recipes are designed to be unpalatable (gritty, bitter)".
What I don't understand is why anyone would want to make a dough that smells like it should be edible and then expect the child not to want to eat it. The banana playdough "smells just like freshly baked banana bread". The "Melting Ice Cream Dough smells like real ice cream". Let the child mouth plain dough instead of giving them contradictory sensory messages and setting them up for an eating disorder.
Finally, her use of food items to make doughs and clays is disgraceful. Children can have sensory experiences with food as well as "toys", so save the peanut butter, canned pumpkin, cinnamon, cocoa powder, frosting flavor mixes or pumpkin pie spices for cooking.
I will try some of the activities. In Ice Excavation, you freeze several objects within a column of ice and then the child uses warm water in a squirt bottle to melt the ice away.