In a crowded field “a wealth tax” is a phrase I’d like to see sunset. The UK has quite a few wealth taxes - including IHT and CGT. What these genuine economists don’t do is put a new tax on wealth in context of existing levies. For example Norway’s annual wealth tax came after its Inheritance Tax was abolished. If the UK wants a sensible public policy debate then all taxes on wealth should be in scope - and so cover the (probable) merits of moving from an event driven tax (at sale, death) to a recurring annual levy.
In reality some of Polanski’s preferred policies, like a wealth tax, have the support of economists like Thomas Piketty, Gabriel Zucman, Joe Stiglitz (Nobel winner), Mariana Mazzucato & Branko Milanovic.
Beyond silly to say these are marginal figures.