I guess I would have preferred some kind of qualifier at the beginning saying it’s not written by a human
This is an opinion. Is it yours, or the AI's? Moreover, is the AI just trying to be agreeable or is this coming from a platform that has a political agenda, in this case supporting the political actors that are in charge of this visa change? These are the questions that we need to ask ourselves in these modern times.
It's long been a norm on HN that summary/tl;dr comments are not welcome. We want people's comments to be in response to the full article, not the summary. Sometimes a summary will be an inaccurate representation of the article, and when users base their response on the summary (without reading the article), it poisons the comments thread.
You weren't to know as it's not explicitly stated in the guidelines, but it is one of the norms that the moderation team and community has converged on over many years.