Thank God they did notice even if it was later than they or others would idealy have liked. They then took positive action and put the aircraft in a safe place so good for them. I rather suspect that the lessons they took away will be more firmly imbedded than anything a flight school could impart.
For me its a reminder that any of us on a given day can make errors. I have seen mates I regarded as better operators than I kill themselves by making basic errors and if they could manage it then I am certainly not immune. The thing is we all want to make the evidence fit our model of what we think is happening and the visual cue of an ILS is a strong one. Would I have done any better on the day, don't know. I can only hope that the penny would have dropped and that I would have taken the same positive action.
It has made me think though, which I guess is the aim of the video so thanks for sharing it.