Because in his view, if you use AI and don't disclose it, you're a liar. And if you use AI and disclose it, he won't trust you anyway.
If you’ve “written” something with AI, I have idea if you even read it, thus I have no idea if it even really reflects your thoughts. And I don’t care what a computer has to say, I care what a human has to say.
The problem we have now is determining if the person actually wrote it. It suddenly got a lot easier for people to get someone else to generate text. And there are a lot more lazy humans than skilled writers.
At a more fundamental level, if AI generated it then I have no trust it is actually true or reflects facts or matches reality. It's insulting to throw AI slop at us because you expect us to read something you didn't bothered to write or perhaps even read. The text is probably all wrong with a veneer of well sounding verbiage, and potentially is created to drive engagement instead of actually communicating useful information.
People are allowed to set their expectations/standards but in 2026 taking the position that use of AI is lying (when not disclosed) and trust destroying (when disclosed) is basically going to set you up for a lot of disappointment. It's just unrealistic.
For better or worse, AI is being used everywhere and it's harder and harder to spot, especially when the use is "thoughtful". Your only real defense is to think critically about the content you're consuming to determine whether it's accurate and has value.
It's not, only suckers think otherwise. The more you consume, the easier it gets to spot them, and also you get bored of it quicker. Which is fine for an actual tool.
IMO: if you think it's problematic if people could spot AI tool marks, you're not actually viewing or using AI as a tool. Rocket scientists aren't ashamed of using high end 5-axis CNC or SLS laser metal 3D printers to make rocket engines. Good machinists can tell how they were made, and that should mostly inspire confidence. If someone thinks the tool marks for a specific type of a tool needs to be hidden for the artifacts to be trusted, there has to be something wrong somewhere with the tool or how it's used, or both. Likely both.
Anyone looking at a Boeing 787 can tell that it flies on a pair of turbofan engines, and it's cool. Most people looking at AI images can tell it's generated using AI, and some can even identify models used, and that is NOT cool. That should be a strong enough sign that something is wrong with AI.
Better to be Socrates dissatisfied than a fool satisfied.