It later clarifies that the clustering evidence is only focused on teenagers and young adults.
I would assume that those 3 cases are not applicable to the vast majority of full time working environments. If people are using this study as a reason to avoid discussing death by suicide in the workforce, it's because they just don't want to deal with it. If they were motivated by a higher moral purpose, they could ask for advice from a mental health professional or non-profit.
While there may be some cases where it is the right thing to do, silence by default perpetuates the shame and taboo around the subject which can affect the living and prevent them from seeking support.
https://mentalhealth.org.nz/media/reporting-and-portrayal-of...
I guess to be safe they sort of publish it without many details. Just "Person found dead at such and such".