I just don't see them pushing conclusion here. I see the opposite, pushing science itself and a reminder that the results are sometimes not what you would expect.
Curiosity would lead them to consider the WiFi preventing all growth absurd, and look for the real cause. That would be a valuable and interesting experiment. It's when it gets infected with predetermined conclusions that it's just pretend experimentation.
I saw that they used an LED bulb and wondered how much RF those give off. Surprisingly my RF meter showed basically nothing on three different brands of LED bulbs. It would have been comical if their light source gave off more than the WiFi unit.
They appear to have measured RF in both setups.
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