Hey Maxi Contieri, good article!
I feel, however, that the wrong vs. right cases you provided are not comparable with each other. The "wrong" example is an if/else and the "right" one is an if/else-if/else.
Implicit "else" seems fine to me when the "if" body is surrounded by curly braces, if not then I'd prefer a ternary return assuming there would only ever be two cases.
From my point of view, the most important takeaway is the suggestion to give up on the if/else* block altogether and replace it with polymorphism.