Yes, that's definitely a bad idea because the community picks up on it and dismisses the entire comment set as generated. Generated comments aren't allowed on HN, and readers are super-sensitive about this these days.
The non-native speaker point is understandable, of course, but you're much better off writing in your own voice, even if a few mistakes sneak in (who cares, that's fine!). Non-native speakers are more than welcome on HN.
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...