Important note about muddling: you're just looking to get the mint to release the oils, but not the chlorophyll. Dont beat the hell out of your mint, just press it against the sugar a couple times.
If you press the mint too much, it will give you a bitter herbal flavor that is not desirable.
I don't remember where I heard it, but if your evidence starts and ends with "It looks like..." then its probably bullshit.