This was the situation in Australia:

https://www.news.com.au/technology/science/human-body/dr-kerryn-phelps-reveals-devastating-covid-vaccine-injury-says-doctors-have-been-censored/news-story/0c1fa02818c99a5ff65f5bf852a382cf

Some key quotes from the former Australian Medical Association (AMA) president.

“This is an issue that I have witnessed first-hand with my wife who suffered a severe neurological reaction to her first Pfizer vaccine within minutes, including burning face and gums, paraesethesiae, and numb hands and feet, while under observation by myself, another doctor and a registered nurse at the time of immunisation,” the 65-year-old said.

The diagnosis and causation has been confirmed by several specialists who have told me that they have seen ‘a lot’ of patients in a similar situation.”

Her comment which is what I was referring to:

“Regulators of the medical profession have censored public discussion about adverse events following immunisation, with threats to doctors not to make any public statements about anything that ‘might undermine the government’s vaccine rollout’ or risk suspension or loss of their registration,” she said.

It was very real here. I'm not sure where you're from, but here, if anyone didn't say exactly what they were told, consequences were real.

Hence, those nurses in the linked story from OP, I personally feel probably knew, but were fearful. I can't say that for sure though. Based on how things were at the time, it would make sense.