I think you are missing the point of the statement. If one was designing a language meant to be developed in an IDE, you can hold various assumptions which would influence how syntax shapes up.

A trivial example which is not related to rust but I think serves as a decent example, you can assume the IDE will color/italicize/etc member variables to get rid of _var __var var__ nonsense. You can also use slightly less verbose terms even if they are less informative if you assume a tooltip with a concise and complete explanation pops up.