Let me play devil's advocate.

The rich haven't been driven out of NYC yet in significant numbers at least according to AI:

While New York experienced a notable exodus of high earners during the pandemic—with roughly 1,453 to 2,400+ millionaire taxpayers leaving in 2020-2021—the state and city actually saw a net gain of wealthy households overall, with a net increase of 17,500 millionaire households between 2020 and 2022, according to the Fiscal Policy Institute.
Key Details on New York Millionaire Migration:
Net Growth: Despite high-profile departures (like Carl Icahn) and fears of a "wealth tax" exodus, New York's total millionaire population grew, rather than shrank, as a booming economy minted new high-earners faster than they departed.
COVID-era Exodus: In 2020-2021, a significant number of high earners left the city, with reports indicating 300,000 top earners moved in 2020, and ~1,453 to ~2,400+ "millionaire" tax filers leaving in subsequent reports.
Migration Trends: Those leaving often moved to lower-tax states such as Florida, Texas, and Tennessee.
Tax Impact: A 2023 Fiscal Policy Institute report noted that in typical years, the top 1% leave at a lower rate (-0.2%) than the general population (-1.0%).
Current Status: Despite the churn, New York City remains home to over 400,000 millionaires, the highest concentration of any global city.

My guesses are

1) Mandami knows exactly what the risks are and they aren't great.

2) Many/most of the wealthy are libs themselves and love the aroma of socialism mixed with NYC alley way sour milk stench.

3) The pied-a-terre tax is basically just creeping up the thermostat of the pot of simmering frogs.

I think we're going to have to learn to live with Mandami's shit eating fatuous grin.

Unfortunately, the libs are going to take away the premise that high taxation rates are a net good with no downsides based on NYC's record.