Certification requirement summaries need to be mindful of words such as
"shall"
"should"
"could"
"must"
Basically there is much wiggle room between a certification rule and its advisory or "how to" comply part that goes with it.
For engines installed in aircraft, it's impractical to design and test for all possible combinations of failure conditions. However in the end it's the degree of threat that should be shown to be minimized by means, that meet the certification requirement.
And even after that is met, anything that happens in-service need be addressed under continued airworthiness, so no one can hide behind a presumption that being originally certified is good enough