Nobody is robbing delegates from Trump. No one is buying delegates. Trump failed to follow the process in place to elect delegates for the national convention.
What Trump did in Louisianna is akin to filing a lawsuit and then ignoring the rules of procedure that govern (civil) lawsuits within the judical system.
Ignorant of the legal process, Trump essentially wants to skip the trial and go straight to closing arguments in front of a jury that he had no interest in picking.