That is not true, that solves temporary i'm agree (short term) the problematics of high fees and increases the capacity of number of transactions /s but the total blockchain size would become exponentially faster a problem than with little blocks, this isn't elegant at all this is just basically a brutal short term approach, with that said the code of BU would cause many security problems and uncertainties on the immutability of Bitcoin now and that will mean the end of the project and would mean a big NON SENSE for investors who are searching a mean of storing value via a secured and immutable system.
And by the way The Core blocks represent still 73.4% of the blocks, BU is a minority which want to spread political rhetoric and non-scientifics argues to divide the Bitcoin community and kill bitcoiin because of their greed and their egocentralized point of view