One of the few aspects of generative AI in coding that to my knowledge has never been controversial is that no matter what, the code's human author is fully responsible for it (even if an LLM actually wrote it). So adding anything about LLMs in a commit message has never been a real way to escape responsibility, even a little bit. Maybe this author's workplace is different, but I kind of doubt it, and even then they're not only talking about their coding at work.
The author goes on to say that they also do want to be transparent about their LLM use, and they suggest some ways to do so...great! On the receiving end of the code, that's all I need. There's nothing sacred about the commit message in my opinion, to make it the one true place to disclose LLM assistance. So ultimately I don't think I have a huge disagreement with the author, just that their justification makes no sense to me. The only time I hear that LLMs supposedly help you evade responsibility is from people trying to avoid disclosing LLM use.