They reported the 160mb as uncompressed (and probably unstripped?) size. If you compress that it will be aroudn 50mb, still more than your 3mb xz example but at

They reported the 160mb as uncompressed (and probably unstripped?) size. If you compress that it will be aroudn 50mb, still more than your 3mb xz example but at least you're now comparing apples to apples