That is unfortunately false. Yes, black borders have been eliminated from some of Nintendo's most appreciated productions, but 99% of those games are still locked to irritatingly slow 50hz gameplay, aside from a few sparse occurrences (such as the Hanabi Festival releases, but that's because they actually contain modified JP roms).
You can find quite a lot of reports on the web, supporting with adequate proof the ubiquitous presence of this fallacy on Virtual Console.
It's not even a Nintendo exclusive. Back in the day I bought the PAL VC release of 'Sonic The Hedgehog' for MegaDrive / Genesis and, trust me, it's dreadfully slower almost to the degree of being unplayable.