it is true. during the primaries, it's (private) delegates that matter, not (public) votes. primaries are not like a general election. they are beholden to the respective party, and party delegates from each party nominate candidates for the general election. it's like pap or wp members nominating their preferred candidates for the general election. the party can do whatever they wish with their bylaws and rules. they are not part of the country's constitution.