Even if it wasnt written on the advice of a therapist it sounds like something a very distressed (but innocent) nurse might write.
Feeling guilty about not being a good enough nurse or carer or spotting signs fast enough.
I recall a past unexpected family bereavement, lots of people gutted.
A lot of people were feeling guilty and thinking IF we had done X, things would have been different, the person was let down, we somehow betrayed them.
If we had just done this, or seen this small medical sign...
We all felt it.
It was totally illogical and irrational given the circumstances.
None of us were medical professionals or was caring for the person at the time. Or even physically present
But it was a way of processing and trying to control extreme grief and shock.