If a safety-critical computerization project didn’t have Level 4 automated testing, would this be clear?

evidence that the project had been sabotaged from within ?

Do all successful safety-critical computerization projects have Level 4 automated testing ?

Do all successful safety-critical computerization projects have automated testing ?

What would possess an organization responsible for safety-critical computerized systems not to have “Level 4?

automated testing” ?

Are safety-critical system developers immune from prosecution ?

The paper A Maturity Model for Automated Software Testing, by Mitchel H. Krause,
was originally published in 1994.
Here is an except:-