I personally helped retrieveing a JS1 which got seriously damaged in a landout following jet failure. I also know at least two more JS1 owners who landed out due to jet failures. In fact, I don’t know any JS1 which did not have jet failure at some point. And this is not limited to JS1. I know of couple more non JS1 jet failures. So no. This is clearly not nonsense.. Looks like jet is not any more reliable than piston.

Ramy