I'd suggest that the miracle escape is testament to ~100? years of evolution of civil aviation safety practices.
"a surprising and welcome event that is not explicable by natural or scientific laws and is therefore considered to be the work of a divine agency."
Or, if you’re an economist, just anything mildly unexpected.
It was the intended, purposefully engineered outcome for precisely such an event. Not even remotely a miracle. The airframe designers at Airbus saved those lives, not divine providence.
There is a lot of variables in an accident like this. If some of those variables were different, this could have been much worse, despite the hard work of the engineers at Airbus. That's what makes it a "miracle".
In general, I disagree that calling something a 'miracle' implies or withholds credit from those responsible for the outcome. It's very pedantic.
That's 379 lives saved, is the number not important, or is it the ratio?
Depends on your definition. From https://www.merriam-webster.com/dictionary/miracle
miracle
1. an extraordinary event manifesting divine intervention in human affairs the healing miracles described in the Gospels
2. an extremely outstanding or unusual event, thing, or accomplishment The bridge is a miracle of engineering.
3. Christian Science : a divinely natural phenomenon experienced humanly as the fulfillment of spiritual law
Most of the people surviving an event where they would have been expected to die certainly qualifies as "an extremely outstanding or unusual event, thing, or accomplishment".