I believe the point is that they made the math to match the observations. If their assumptions are incorrect, then the math they made up will be based on those false assumptions, like current cannot exist in space. Which does not make sense to me since we obviously have the northern lights being created by current flow from the sun. And now we know about the magnetic tubes that form every 15 minutes that connect from the sun to the earth. Perhaps the assumptions made decades ago need to be revisited.
Now I will admit that some of the extents they go to on that site go too far and seem too much of a stretch. Everything gets put into being evidence of the electric universe even when there are simpler explanations. But the basic idea of current flow at massive scales may have some merit.