That "this is a WIP" was added after Ferne responded to everyone.
And even then there is no logical reasoning why someone would -expect- those colors to be there and not be the real ones unless they were told it was so the modelers eyes dont burst - which was something I always wondered anyways (how do they look at a big gray block for so long and not cry) lol.
"It doesn't look like the concept art"
Isn't sufficient reason to think those are not the real colors
"It doesn't look like X"
Isn't sufficient reason to think those are not the real colors
"Its in alpha"
Isn't sufficient reason to think those are not the real colors
Literally - its not obvious.
People with experience in that realm may know whats going on (and a few politely described it, thank you to those people

), and then there are people who like to assume their opinions are facts "obvious because I feel so".