This is probably easy mode for it, given the tiny vocabulary at hand, even though it has surely seen very little Toki Pona in the wild. Large language models are extremely good at translation. I’ve personally tested ChatGPT-4 against Google Translate and other translators on some hard translations (languages that are not similar to English, such as Chinese), and it has consistently provided better translations than Google Translate in my opinion. As an example, for validation purposes, news stories that have been reported worldwide make things easier, since you can establish the facts of the translation by hand, and then compare what comes out.
What does your comment actually add to the discussion? Yes, ChatGPT can be wrong. So can Google Translate!
If you’d like to provide a clear example of ChatGPT-4 (not ChatGPT-3.5) making up a Toki Pona translation that is completely disconnected from reality, please do. That would be legitimately interesting conversational material. General cynicism isn’t.
ChatGPT absolutely has limitations, and translation is a hard problem, even for the industry-standard tools. Crossvalidation with multiple translation tools and ideally humans is important for any translations that actually matter.