Missing ingredients from the recipe

Amounts e.g., 300g creme fraiche, and details for other ingredients, at recipe author's site.
Theitalianbkr.com
Also, a similar ganache recipe out there by Dominique Ansel, baker known for the cronut

Steps 10 and 11 have them, but not sure of the amounts … the gelatin is listed but there must be another addition of white chocolate and not sure about how much creme fraiche. Maybe experiment with adding proportions if you have the time?