There is a chart with "Do say" and "Don't say" listening appropriate and inappropriate phrasing examples.
I will ask an extreme question about it then make it a bit less reductionist.
The chart doesn't say whether "I'm sorry I caused your son's death" falls under "Do say" or "Don't say".
The thing is, although the above line exaggerates, if you are being transparent then there are a LOT of statements that reduce to "I (we) caused your son's death", but which are much more technical, i.e. regarding what was done.
In this case it is unclear whether these are to be avoided or can be mentioned? It says "These steps include informing people about the incident" but it is not totally clear whether they mean it.
Malpractice is the third-leading cause of death in the United States[1], so my question isn't an idle one.
The PDF could be far more specific here.
[1] https://www.google.com/search?q=malpractice+as+cause+of+deat...