Neither of those links seem to include much evidence of causation (as opposed to the correlations they assert). Maybe the second one's evidence to that effect is behind the paywall? What measures did they take to rule out other causes? Are the mechanisms by which these substances allegedly cause cancer actually understood (as they are for e.g. tobacco)?
And yes, all bacon, by definition, is processed meat according to WHO's definition. Bacon is salt-cured meat and the WHO considers processed meat as "meat that has been transformed through salting, curing, fermentation, smoking, or other processes".
(Also: not all bacon is processed)