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The soil in the "microwaved water only" pot is really really wet, while the soil in the "purified water" pot is not nearly as wet. He obviously didn't control for the volume he was adding and over watered the one plant (perhaps on purpose).

Microwaves just happen to be of the correct frequency to result in the water absorbing and releasing some of the energy as heat. They don't cause any changes to the water molecules.

Some random guy who knows has no scientific background (obvious from his name-dropping of random chemicals and proteins with no further explanation) who is using a 10-year-old girl's science project as evidence for his theory? So what?