The claim that the evidence is "circumstantial is one that you would have to support. But I never see deniers of science ever defending their apparently false allegations.
From this source:
https://www.pnas.org/doi/10.1073/pnas.1516944112#:~:text=The evidence for the existence,in the universe, gravitational lensing,
"The evidence for the existence of dark matter through its gravitational impact is clear in astronomical observations—from the early observations of the large motions of galaxies in clusters and the motions of stars and gas in galaxies, to observations of the large-scale structure in the universe, gravitational lensing, and the cosmic microwave background."
That is not just one source. That is four or five different sources. Meanwhile there does not appear to be any evidence for the electric universe. Without a coherent testable hypothesis they by definition cannot have any evidence.
The big problem is dark matter and dark energy has never been observed in the lab to prove these are real and self standing. One could just as well say invisible unicorns=dark matter, since they cannot be seen in the lab, either, but could be used as a placeholder for what we see.
My theory is this problem is connected to the current theory, that the universe has no center and is expanding in all directions, simultaneously. In this theory, the universe is sort of like blowing up a balloon. This will cause all points to move apart in all directions, at the same time.
The problem is without a center of mass or gravity, you cannot do a universal energy balance for the universe that is consistent for all. What ended up happening was the energy balance for the center-less universe kept changing with each new discovery, until the standard model needed a bandaid to account for the larger and larger differences. This was deemed dark matter and dark energy. But these have yet to be seen in the lab to know if they exist as phenomena, all to itself, and was not just a theoretical placeholder for something else for the needed extra energy.
Without a center of the universe, references become relative, as do your energy balances. This creates a problem, if you choose the wrong reference to define the universe; you may be too high or too low.
As an example, say you have a man on a train at velocity V and a stationary man at the station. Both men had been asleep and neither knows who is moving. If we assume relative reference, either man can appear to see and claim the other is moving, since their two references will appear relative.
However, if you assume both frames are relative and do an energy balance, the moving train will have required more startup energy than a smaller moving station. Relative reference does not always allow a consistent energy balance in all relative frames, since it only deals in velocity, but not with mass which, unlike velocity, is invariant.
In the case of dark matter and dark energy, they were needed to add energy to the theoretical universe that was not needed 50 years ago. This is like assuming the man at the station was moving, which left us with too little energy to explain the total system fuel usage. They needed to add extra energy by means of a bandaid theory. This bandaid is being challenged, but not in terms of an energy balance, but in terms of a different addendum.
The science bureaucracy does not wish to change the standard model, so one is expected to work the bandaid, instead of start from scratch in a way that allows for a center of mass or use the speed of light as the reference for the energy balance, since this is same for all.