This should be the sticking point to invoke the 25th. Officials need to be loud and make a stink about how Trump can’t tell fact from clear fiction and therefore cannot perform the duties of the office. Make the people of America see the image on the news everyday and make those on his side say out loud if they think it’s fake or real. Half of the masses will never be convinced that he lacks the morality to lead until they’re already in his camps. This is the earliest clear as day moment to act on that which cannot be held to subjective scrutiny or partisanship.
Trump’s advisor situation has gone from yes-men to North Korean sycophant fairy tale land. If those around him saw he thought it really said “MS13” then I doubt anyone said a word, and instead probably just fed into it.