Looking at the two examples, they primarily stand out because there are two almost-identical ones, not because they're so obviously bot-generated that I'd go out of my way to flag'm. So I'd say they're doing a pretty good job already.
And quickly you start to question your sanity. Like... is this post (https://news.ycombinator.com/item?id=41076632) bot-written? it's written a bit oddly, could it be a bot? Who's to know?
The famous "firehose of misinformation" is hitting new high scores in the game of modern civilization.