Like others here, I find the way this article discusses things a bit odd. I think a more interesting question is to emphasize SYNTAX (the word doesn’t seem to appear in the article). Which languages have special syntax that maps to an AST node as OP(a,b,c)? Focus on syntax and things like range(start,end,step) dont fall into this category.
I don't think they're saying that such a range function is itself a ternary, but using that as a lead-in to discussing the Frink ("1 to 100 step 15") and Elixir ("1..10//2") syntaxes.
