Not sure what the parent comment is referring to exactly or if they are also conflating things but:

Nitric Oxide = NO

is not the same as common carcinogens in foods like

Sodium Nitrite = NaNO2 or Potassium Nitrate = KNO3

Both of these nitrates turn into NO in the body.

https://pharmrev.aspetjournals.org/cms/10.1124/pr.120.019240...

While it is a cancer risk this is not true for all peoples.

Thanks.