I had to google "Cruise". To save others a moment or two, Cruise is a self-driving startup unrelated to Alphabet. In the quoted sentence, "they" != "Waymo" (I wasn't sure).
HN is getting to reddit's status where people make comments and everyone just upvotes because it sounds good to them.
I became a HN regular because I saw some insightful comments backed by quality moderation. I was escaping the dumpster fire of reddit so it seemed like paradise by comparison. Over time, my usage of HN grew, and I became more exposed to the reddit-like mentality that pops up on certain topics or at certain times(i.e. weekends).
I think the quality of HN varies depending on where the more serious users are in their development schedules. It would be an interesting thing to analyze I suppose.