Last year I went thru First Aid training. The teacher was a professional fireman.
Here is what he told us when asked if we should use them on the street:
"For us (pros) it is a professional mistake (liable to sanctions by management)
not to use both of them" followed by "but you can do what you want".
In this case, the problem is not to know if it would have saved the passenger or not, but more to the point, how is it possible to have cabin crew not knowing the content of the first aid kit?
Could it be due to lack of training?