What is the meaning of the starting player rules in Tzolk'in?
It's a joke, referencing the fact that many games these days have means of determining a starting player that are somewhat arbitrarily related to the theme of the game but where there's nothing stopping you from choosing the starting player however you like. For example, the player with the pointiest ears is meant to be the start player for Small World, while Chrononauts has everyone guess the time and the person closest to the truth gets to start.