The description is incorrect. I posted a Support Query, and didn't get a response. After resolving it myself and marking it as solved, it was removed. So this is for other potential users.

Look under Logic, change the lower 3 calls(EnvironmentIsDevelopment() , EnvironmentIsTesting() , EnvironmentIsProduction() ).

In each Assign, change the "DEV", "TST" and "PRD" to "dev", "tst" and "prd" respectively.  (Site.EnvironmentType_Max3Chars = "dev")

And remember under Data, Site Properties - EnvironmentType_Max3Chars to the aforementioned LOWER CASE versions despite what the description says.

Otherwise, this is exactly what I need for my current (and future) projects