Well, the bit about platonism may be. Tegmark, I believe, came up with a notion along the lines of “well, if all mathematical structures are in some sense ‘real’, then we just need to somehow parameterize the set of all mathematical structures that could contain beings ‘like us’, then compare our observed universe to the ‘most average’ structures. If we differ significant’y from that, it’s evidence against the proposition.”
Well, the bit about platonism may be. Tegmark, I believe, came up with a notion along the lines of “well, if all mathematical structures are in some sense ‘real’, then we just need to somehow parameterize the set of all mathematical structures that could contain beings ‘like us’, then compare our observed universe to the ‘most average’ structures. If we differ significant’y from that, it’s evidence against the proposition.”