You are referring to 2 comments both heavily downvoted.
I think the reason is that most of HN is not very knowledgeable of manufacturing generally (one commenter was shocked at spending $400m on a factory), combined with hatred for Peloton (for whatever reason) specifically.
It's true that comments sometimes get downvoted unfairly, but I'm not seeing that in this thread. In such cases, though, the thing to do is give them a corrective upvote: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor....