The person in question (Richard Feldman) is the creator of Roc, which the linked article is about.

He also shows up in the comments here https://news.ycombinator.com/item?id=42954103

Presumably https://news.ycombinator.com/item?id=42954103, which does not really concern Elm.

He’s the author of the article but only chimes in once.

Sorry for not linking it, just wasn’t sure I wanted a Google Alert, but it seems likely at this point and I don’t mind. I’m somewhat undecided about Elm and Roc. Both are at least innovative.

Not sure what you mean by Google Alert, what is that regarding?

A Google Alert notifies when a search term, such as someone's name, appears online, so mentioning someone in a public comment might trigger an alert, causing them to notice it.

I see what you mean, that's probably pretty unlikely though as the vast majority of people, even developers or leads, don't set up Google Alerts.

The “his comment” link here for this article: https://lukeplant.me.uk/blog/posts/why-im-leaving-elm/#forka... In the HN submission I linked, the author of the article is the same.

Now I understand, the author is (or was, I suppose) a core team member of Elm, I thought it were someone that commented on the post instead. I interpret "showed up on HN" to typically mean a commenter rather than an article author as typically many authors don't even realize their article was submitted to HN on any particular day.