I don't think the original quote is really a criticism (in the sense of "this is bad and must change") of museums in itself. It's using museums as an example of

I don't think the original quote is really a criticism (in the sense of "this is bad and must change") of museums in itself. It's using museums as an example of capitalist realism - the idea that capitalism today is so dominant and malleable that it's able to basically "corrupt or co-opt" anything, and that we reflexively view everything through capitalist lenses. That even these artifacts that might have once been immensely important to the workings of a non-capitalist society, now exist dead, entombed within a capitalist construct - and as a sibling notes, as literally little pieces of capital.