Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics
SalesBundles

He may not be the only one to find them as others found secrets but didn't put it in their youtube title and might be within the video itself you have to browse to confirm.

So no, he is probably not the first one as the game also tells have a section listing all youtubers who found secrets in the game so far of the latest update.

Deleted post