It’s hard to compare apples to apples here: there is, for instance, a 5-bedroom apt in North TA for 4850k and a slightly bigger on on RSh is 4500k, 7% difference. Other pairs with higher percentage difference can be found, but it’s hard to extract the median or average.

But even if your estimate is correct and the difference in prices is “categorical”, the author of the piece could simply have had in mind the streets with private houses, which mostly cost north of 1.5-2 million USD. This is rather plush, I guess.