Interestingly the paper they cite for more-constitutional alternatives to a wealth tax actually includes a wealth tax in its suite of options and argues in favor of the constitutionality of a wealth tax (p 25)

E: I should add it disagrees with the central argument that this would be a “direct tax” and mentions ways the wealth tax could itself be structured to give the Supreme Court less of a leg to stand on. Personally I’d rather run a candidate that would even bring this fight in the first place. Maybe if it’s on the news then the >99% of viewers will realize that the <1% are able to beat them down easily in any legal fight imaginable despite their incredible small numbers and harmful distribution preferences.