Clark writes:

The actual training which you have never had and clearly don't understand is
to know when turning back is not an option.

It's the other way around: Training is intended to make it clear that turning
back is not an option by default, not by exception. As a general rule, you
never try to turn around.

As a side note since you obviously don't understand the entire problem
presented in the ASF short, the aircraft did not suffer a total power loss.

That's probably why he lived. But many pilots will accidentally or
deliberately overlook that important detail.