That dent is going to most likely require an entire outside door skin to repair it. From what I've been told, steel has a 'memory' and a dent can be popped out to the steel's original 'memory' for that shape such as a door or hood or roof. Aluminum does
not have a 'memory' like steel so a dent doesn't just pop back to the original shape.
I've seen some examples of small dents being hammered back into the original shape of the hood / frunk or door but they were much smaller like the size of a small dent from a baseball.
Here is a portion of my invoice that shows the door panel and here is a breakdown of the door items:
$723.00 = Right Rear Door Shell part #6006566E0F
$367.50 = 4.2 hrs Labor @ $87.50/hr
$193.80 = 3.4 hrs Paint @ $57.00/hr
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$1,284.30
$89.90 = 7.00% tax
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$1,374.20 total
The other driver might be better off paying their insurance deductible if they don't mind the accident going on their record. I can't imagine they would have higher than a $1,375 deductible -- assuming they have insurance. They were probably unaware that a dent like that can probably not be simply 'pulled' out of the door for $300.