He's just adding beta glucans to the wort. I don't think that is the best way to add them to the wort. Its better to mash it and leave the grain in the tun and avoid any possibility of tannin extraction.
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I suspect the rise you are seeing is due to water evaporating from the hot sample. I haven't tested that hypothesis, but I cool my sample in a covered cup before measuring.Shouldn't be the case with the cover plate closed. But could be.
But now I wonder, would it not be better even than a stir plate to get an aquarium pump and a sterile filter and just continously bubble air through the starter?
Can you store them with the probe immersed in distilled water?