The devil is in the detail when one looks at the price point.
Many people are happy with a budget machine that works OK. Only purists know what colour what
should be where
My rule is you can get away with non-original coloured components if they look as though they might belong there and don't look out of place.
The darker brushroll housing doesn't hurt it (this stuff is becoming limited in colours available anyway as Dyson rush to kill the non-ball parts supply). I wouldn't personally use a valve cover with yellow buttons, but that is probably easy to say when you have a few hundred in boxes to choose from. On its own, it is a non-issue.
If it's less than £100, the machine looks fine.