How Does Major Choice Work for ELC Qualified Candidates Who Were Shut Out of Chosen UCs

Is there a difference between ELC and Statewide Guarantee. After my son submitted his application he saw a message that he qualifies under the Statewide Guarantee because be is in the top 9% of the state based on some index. There was no message about ELC and his school does not rank. I assume he is not in the top 9% of his school but is in the top 9% of the state - is that an accurate way to thinking about this.