Natural languages suffer from ambiguities.* Each word in Toki Pona has more than one meaning. If sensory inputs are present when A.s.a. hears/sees a word then these may offer sufficient context so as to resolve the ambiguity. When reading Toki Pona A.s.a. will have had various concepts activated by previously input words and sentences. This will also provide some context for subsequent word-sense disambiguation.
* See, for example, Artificial Intelligence: A Modern Approach, 4th edition, Russell and Norvig, Pearson, 2020, page 252.