When copying from 𝓞 into 𝓟, Oliver Cowdery initially wrote “in the truth” but then erased the definite article the. The original manuscript is not extant here but probably read “in truth”. Either possibility, with or without the the, can be found elsewhere in the text, although “in truth” dominates over “in the truth” (five to one):
For 2 Nephi 33:6 the critical text will follow the corrected reading in 𝓟.
Summary: Maintain in 2 Nephi 33:6 the prepositional phrase “in truth” (that is, without the definite article the).