By the way ...
If you want more evidence of hot gas existing between galaxy clusters then here it is:
Hot gas bridges galaxy cluster pair
A galaxy cluster is not a "structure" of spacetime. Like all things in the universe it exists within spacetime.
Your ignorance of the intracluster medium is showing in that 'current heating' remark:
The ICM is heated to high temperatures by the gravitational energy released by the formation of the cluster from smaller structures. Kinetic energy gained from the gravitational field is converted to thermal energy by shocks. The high temperature ensures that the elements present in the ICM are ionised. Light elements in the ICM have all the electrons removed from their nuclei.
I love the way that you go on about a minor bit of jargon (that astronomers tend to use gas for plasma and vice versa)

I love the way that you go on about a fantasy that using the term gas means that astronomers ignore the electromagnetic properties of plasma

I love the way that you ignore the actual scientific paper where plasma (and gas!) is mentioned

Planck intermediate results. VIII. Filaments between interacting clusters
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