None of these are calls for wealth taxes. These are calls for income taxes.

This is called “pulling up the ladder.”

Bill is calling for higher capital gains and inheritance taxes, so not income taxes anyway.

The ‘Millionaires for Humanity’ don’t specify what taxes they’d like to see raised, but they emphasize they want it on themselves.

And from the third article:

> Several members, including Molly Munger, the daughter of Charlie Munger, the longtime vice-chairman of Warren Buffett’s firm, Berkshire Hathaway, have spoken in favor of a wealth tax.

At least two of the articles specifically mention increasing non-income taxes to tax wealth specifically. It seems likely the third one does too, since it's specifically about inherited wealth, but I didn't see a specific reference either way at a glance.