The article misses the point; California moving the California primary helps California, because candidates that do well in California have an advantage in the primaries. It's not about being a bellweather or helping the party. 

The whole primary system has baked in this pointless arms race between the states, where they jockey for position in the calendar for influence. Everyone talks about how their state should go earlier because it's in some way more "representative", but it's always bunk. 

The solution to this is to come up with a fair nationwide primary system - but that's impossible because primaries are run by the states. So we're stuck with this kind of nonsense.