>Most of the gains on tradeable assets like stocks would be taxed at the existing capital gains rate, which is currently 20% for individuals earning over $445,850.
That quote is putting the 20% rate in context, it's not saying that anyone earning over $445,850 would pay it. The legislation still only applies to the ultra-rich, but they'd be using the existing capital gains rate, which is currently 20% for individuals earning over $445,850.
>Most of the gains on tradeable assets like stocks would be taxed at the existing capital gains rate, which is currently 20% for individuals earning over $445,850.