What do you mean by "developer" in that sentence?
Mostly when I see "developer" it means a person that develops code - a programmer, but here it doesn't make sense in your sentence.
There is putting your Chromebook in developer mode which removes safety checks and a way to use GNU/Linux on a CB. You then can install Crouton.
But then there is putting a CB on the developer channel or the Canary channel which is completely different.
I am currently using both as I can then see what is happening with the host OS while using the new VM capabilities with my PixelBook.