Darwin Proven Wrong?

[Anomalocaris]

Gravitational lensing (when there isn't an 'actual' object there to cause the lensing), and the persistent structural integrity of a spinning galaxy.
These two things alone, ignoring any other things "observed" as dark matter, says that there is something there. Something that causes these effects.

It's simply called 'dark matter' because we don't know what this 'stuff' is yet. But there is sufficient evidence to tell us that this 'stuff' is there.

I agree that astrophysicists claim that gravity has been observed to bend light in certain areas, wherefore they have concluded that as evidence of the 23% of reality being "dark matter". "Dark energy", however, as far as I know, has not been evidenced by any observations and that is supposedly 73% of reality.

Astrophysicists are not in the habit of stuffing the notional universe with thing unevidenced by any observation.

All things talked about in physics are evidenced by some observation. They differ in how much observation, and how comprehensively observational specifies or constrain their properties and behavior. Observational evidence of dark energy constrain its property to a significant degree. For example, it exists because it excerts a force that can be measured and can be distinguished from all other known forces. Its magnitude appears to be proportional to the volume of space on a very large scale, but it's density per unit volume of space is very low. It appears to be rather more uniformly distributed that dark matter or normal matter.

So only evidence allows anything at all to be contineneced in physics. The thing may yet be wrong, because misinterpretation of evidence. But if there were no evidence at all, It won't in physics, it would be in theology.