> Coffman, 70, told police he had mason jars filled with "melted Styrofoam and gasoline." Federal investigators believe that combination, if exploded, would have the effect of napalm "insofar as it causes the flammable liquid to better stick to objects that it hits upon detonation," according to the court record.
> Police also found cloth rags and lighters. The court documents said that those items and the explosive-filled mason jars "in close proximity to one another constitute a combination of parts" that could be used as a "destructive device."
I don't think the article is disagreeing with you.
Also, a Molotov cocktail is commonly referred to as a type of bomb:
> A Molotov cocktail, also known as a petrol bomb, gasoline bomb, bottle bomb, poor man's grenade, fire bomb (not to be confused with an actual fire bomb), fire bottle or just Molotov, sometimes shortened as Molly, is a generic name used for a variety of bottle-based improvised incendiary weapons.