Above are the stats for my childhood home in Bakersfield, CA. Unsurprisingly, given its slightly-better-than-suburb-but-not-much status, its performance is mediocre. If the metric took into account design, B-town would fair worse since the streets are wide, mildly confusing, and missing connections, while public transit is insufficient. On the plus sign, the town has quality public schools, a fair amount of parks, and is very affordable — don’t mean to only talk shit. Plus, the weather their is ridiculous in the summer (100+ daily), so the planners had some justification in abandoning any pretense at walkability.
In contrast, my house in downtown San Luis Obispo, CA gets a 98, rivaling New York. Since SLO’s population is only ~60,000 (which is including the non-incorporated student dorms), I feel this points to how density and walkability can be achieved without needing any great absolute number of people.