Huh, so the sign in Portal 2 was correct!
@lunareclipse Sadly not all signs from Portal 2 work... With some ChatGPT began to explain the logical contradictions to me... Scary...  
But then I realized ChatGPT is just a word-vomiting machine that doesn't think, but just picks the most likely words based on its context and just happened to see the explanation to that contradiction often enough during training.