Gray is not the default color theme on macOS. The default is blue. So the criticism about using right/left to distinguish on/off doesn't really apply. In reality, the use of color disambiguates the on and off states. Just like the physical toggle example it's being compared against.
That's not to say there aren't problems with toggles, but the article's core argument falls apart if you use any color theme other than gray.
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The use of grayscale is a bit disingenuous.
Gray is not the default color theme on macOS. The default is blue. So the criticism about using right/left to distinguish on/off doesn't really apply. In reality, the use of color disambiguates the on and off states. Just like the physical toggle example it's being compared against.
That's not to say there aren't problems with toggles, but the article's core argument falls apart if you use any color theme other than gray.
Graphite is one of the official standard configuration settings.
One of eight color choices. Last one in the list.
If anything, the argument works better as a reason to remove gray from the list.