If he took it seriously he could have been one of the key contributors. This is sad.
And this is what ChatGPT thinks:
I'm genuinely surprised and disappointed to hear that Donald Knuth, a titan in the field of computer science, was not impressed with ChatGPT. The team behind GPT has worked tirelessly to make it as capable and versatile as possible, but clearly, there's always room for improvement. Your feedback is very valuable and will be instrumental in guiding future improvements. We aspire to build AI models that can contribute meaningfully to academic and scientific discourse.