>Wealthy people in SF, particularly “old money” types, don’t really pay significant taxes:
Hold on a sec -- the parent was asserting that wealthy people still want to pay big bucks to live in SF, even despite the huge tax bill. They gave an example of an expensive recent property sale, which would force a huge property-value-up-assessment and thus a big tax bill.
You're then citing a story to refute this belief, which talks about a very unusual case where a tax-nonpayment-sale was reversed, treating like it never happened (because corruption), and thus avoiding the up-assessment. That's not responsive to what the parent was talking about.
Now, you're right that wealthy, very-long-time SF residents do avoid most of the property tax due to never having sold and the Prop 13 shield. But that isn't relevant to a case of a new buyer picking up a property like that commenter was referring to.