Are you implying the same people that are pessimistic about the internet are also AI hypers or tech entrepreneurs? Because HN isn't monolithic, it's entirely possible -- in fact, likely -- that these are two distinct sets of people who both read HN. I know I'm pessimistic about much of what the hype people like.

Edit: or if you meant the grandparent claims not to be a doomer but is pessimistic about something, I don't see the contradiction. It's more like "I don't generally like sweet things, but this cake is nice". Where's the contradiction?