This by definition is deploying something you don't fully understand. If there's a problem in any of those templates you won't know. You won't really know if they even do what they say they do.
Using one to do something as important as this would be crazy.
I don't think he's saying that you should blindly deploy this stuff. But you don't have to create a solution from scratch. There are existing templates out there that you can leverage to build your own solution
This by definition is deploying something you don't fully understand. If there's a problem in any of those templates you won't know. You won't really know if they even do what they say they do.
Using one to do something as important as this would be crazy.