Have you thought that - just maybe - if everyone seems to be using a word in a certain way, and you're not, that you might be in the wrong?
Maybe you're being a tad too literal? Or quibbling about the vagaries of language, when the actual thing being discussed is perfectly clear?
-O
Except for the fact that those people are wrong because they are misusing the word wherein the tiles may depict terrain, but are not terrain.
The tree printed on a tile is a depiction of terrain.
Go smoke that pipe upthread. See how far you get. I want to know how you get your combustible material into it for starters.
Define "chair" as if to someone who has never seen one.