That comparison is strictly based on "bits" and assumes that every calculation will require 64-bit precision when in reality this is actually rarely the case. If it were, the jump from 32-bit computing to 64-bit computing would provide a 100% performance boost, which it most certainly did not. You're living a fairytale.
Bits was not the only thing discussed in that ARM11 vs Broadway comparison though.
If ARM11's were so much weaker than Gekko or Broadway, intact/upgraded ports like Monster Hunter Tri Ultimate just wouldn't be possible at all. If you take DMIPS into account, even the New 3DS' quad core CPU (only three of which are likely available to games) should be beaten by GC/Wii.