I screenshot the example and neither Claude nor ChatGPT had any problems reading both phrases. I don't get it.

1) Make an ambiguous text 2) Feed it to AI and see which of the 2 it picks 3) If it detects both repeat step 2 using minor adjustments or different AI model until AI responds with one of 2 message 4) Make a blog post claiming that AI chose dummy and other message was the real one

Someone had an idea, neat idea, but solved 10 years ago already.

Edit: GPT-5.5 says: "The hidden text is “HAPPY HUMAN.”

The outlined decoy text is “SORRY ROBOT.” Blurring or viewing it from farther away reveals the hidden message."