Oliver Cowdery initially wrote “in the words” for this part of 2 Nephi 33:10, but then almost immediately he corrected “in the words” to “in these words”. The level of ink flow is unchanged, so Oliver was probably correcting to 𝓞. Elsewhere this verse uses these words: “hearken unto these words ... ye will believe in these words”.
Summary: Maintain in 2 Nephi 33:10 the corrected reading in 𝓟: “if ye believe not in these words”.