Discourseは、誰かが特定の年に投稿しなかったが、別の日に投稿したと主張しています

[JammyDodger]

"Last post" message apparently wrong

The message is about the user last post before the post it’s attached to. It means that before the post on the picture, the last post was five years ago, and it’s meant so other users can react properly to either a new user or an old timer coming back.