Get some pH papers and do a simple test.
Below neutral = acid/acidic - like citrus juice
Above neutral = base/alkaline - like mineral water
A lot of people mix them up.
Maybe the rind is alkaline, but I've never consumed much of the rind in juicing. A little bit would remain if I was being lazy.
Whomever this information is coming from is misled and should be corrected.
Don't trust the internets, trust yourself, go to a pool store and get some pH papers and prove them wrong.
I don't know about watermelon though, probably near neutral.
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