i don't understand what he even means
Due to the layout when printing, there is one blank village tile that comes with the game. Normally this is just set aside and you use the nine tiles that actually have something on them.
If you have an expansion, you will have some alternate village tiles. When mixing the tiles up randomly when setting up the village, this variant includes the blank tile. If it is one of the tiles that is placed, the players can choose and of the tiles that were not placed in the village during set up and replace the blank tile with it.