They don't show you a nag box immediately on the first article, but rather wait until the second one. Medium uses cookies to decide whether to show you their pop-up box or not. Blanket rules slow down browsers too much.
Then go to Custom, then check the Import box. To add these filters to your own list, go to the uBlock Origin Settings page,
A set of uBlock Origin filters to conserve vertical screen real estate and remove nag boxes.
