Mbin has a specific and different meaning for the term "post" as used in the OP, so it's one place where translating from lemmy or other "generic internet forum" jargon doesn't work. It's for microblog posts associated with a magazine that are independent of threads in that magazine.
E.g.: https://fedia.io/m/firefox/microblog has "posts" in Mbin terminology -- though if I had to guess I think most Mbin users will use the qualified "microblog post" or similar if they actually mean to reference the Mbin meaning of the term.