The author of the rather lengthy article posted a link to her Blueberry Peach Crisp that you might be interested in. It's in the paragraph beginning with, "I love experimenting ..."
The recipe comes from a paleo cooking magazine the mrs gets. For the topping she used coconut, tapioca flour, and maple sirup which was a bit of a change from the original recipe. The recipe you posted, Q, is very close.