The phrase "went that route" implies choosing a particular path, strategy, or action. Antonyms or opposite expressions for this could be, "chose a different approach," "took a detour," "followed a new direction," or "opted for an alternative route." These phrases convey the sense of departing from the original course of action or deviating from the expected path. The use of antonyms for "went that route" helps to add variation and nuance to writing or speech, preventing the repetition of the same phrase and introducing different shades of meaning.