I wouldn't be surprised if that's misleading considering the other article was suggesting nitrite precursors are usually what's in the food later to be turned into nitrite, but I'd love to be wrong.
You could simply measure the levels of nitrite before any exists and the end product might still have just as much.
Contains the weasel words I pasted in below, which are verbatim what the US producers that use celery salt claim. Also, they don’t list the natural flavors. I’d bet they’re using celery salt, but that UK labeling laws don’t make them break it out as a separate ingredient:
> Primal Cut free-from naked bacon contains only fresh organic fruit sugars and nitrates present in the natural raw organic seasonings.
You could simply measure the levels of nitrite before any exists and the end product might still have just as much.