It is a precinct with very few children, because the homes have views, and the better the view, the higher the cost per square foot, and at a given price point, those with kids would prefer more square feet in lieu of a view. Well to do well educated Californian older white people in large metro areas tend not to be MAGA types. Who knew?
Me actually (including in this very specific slice of the county.) I interact with these people often enough and a lot of them didn't only vote for Biden but also switched their party registration. I'm always shocked by how Republican this demographic is in other states, particularly in the South, considering my experiences with them in Southern California.