All mentions?
Even mentioning about episode that predate s9's conception?
Seems a bit harsh, considering the newest reference was from "Sounds of Silence" S8E23,
which was released over a year ago
Welcome to the world we live in. We aren’t taking any chances. Some of the info out there spoils everything because of Dutch releases. I’d much rather err of the side of caution that let something accidentally invite a spoiler discussion.