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I don't see that at all, I see that 7 minutes after the crash ambulances arrived on scene from San Mateo Co, this seems pretty good to me. I also see that the third set of fire units were dispatched 7 minutes after the crash (this time from the City of San Francisco), again hardly unusual that you'd call more local units in and then escalate to more distant units as needs dictate.

As for the "why hadn't they responded in 20+ minutes", are you being wilfully ignorant? They had responded and were on scene dealing with a 777 in flames and the 300 casualties still in the plane. What took them 20+ minutes was to get to the 1.5% of passengers who weren't in the vicinity of the plane, tragic as that might be MCIs are a numbers game and the the concentrated 98.5% were a higher priority. If you don't understand this, then I'm very sorry and perhaps you should go and read up on MCI management so you can understand this better.