Even the primary anecdote of the post simply doesn't seem realistic to me. Why would you ask an LLM whether a domain name idea is good or terrible? That's an entirely subjective opinion question with no right or wrong answer! And chatbots are widely known for being sycophantic anyway, so the response will just depend on how the question was framed.
OP, if you're actually writing this stuff entirely by hand, you've internalized AI writing style to a disturbing degree.