Its pretty hard to see what they are doing there or why. It looks like the Weber Maggie version does something similar: Weber Maggie.
It looks like it might be knocking down the power coming out of the rectifier a bit and doing a bit of filtering depending if the value is the same as on the Maggie. I’d need to throw it on the modeler to see if it makes an appreciable performance difference. Our two strokes perform pretty well without that.
If Robin is still around he might have some insight.