This is just bs. It’s only a revelation for those that weren’t paying attention. The surtax for high income taxpayers was long negotiated.
And it has zero to do with, as the article says “equity pocketed by a ..seller” . It has to do with profit. Gain. Equity is affected by debt. Gain is not.
This raises the tax rate on high income taxpayers to right around where it was before the Bush tax cuts.
The income level is without regards to wages or other business income. If you earn $400,000 a year from a job, and a have a few bucks in interest income, this tax will not apply.