>Your focus will be in semantics and it is easier to get into it without the syntax aggressively jumping at your face.
I'm not sure I agree with this. As a programmer, your tool for expressing semantics is through syntax. While the author argues that disabling syntax highlighting makes the syntax less important, I feel that removing syntax highlighting places undue stress on the author by removing the first level of immediate validation that the syntax is correct.
I find myself jumping between languages far too often to trust myself to use the correct syntax on the first try, so much so that I consider in-editor linting to be an indispensable tool.
Perhaps if someone only ever wrote one or a few very different languages, they wouldn't have to worry about if their language indexes by range with [a:b], [a..b], or .slice(a,b).