I can completely understand wanting to differentiate from Reddit, but to me, this is a matter of convenience and priority. Putting right after the article implies commenting on the article is emphasized. Putting it at the bottom of the comment page implies a want to comment on the comments.
Maybe there’s a reason I’m not seeing here? Am I just dumb?
~tilde has their comment section setup the same way, and I believe their reasoning is because it encourages you to read the existing comments.
Not sure if @ernest has the same intentions or if it was just a stylistic choice.
Personally, I like that it’s on the bottom of the threads.