@Pelin, the physics side has been covered by someone who knows that terrain better than I do, so I'll stay in my lane and stick to the historical record. Because the account you gave has Newton's position exactly backwards, and that error runs through everything you built on top of it.
Newton did not standardize mechanistic cosmology. He explicitly refused to supply a mechanism at all.
In the General Scholium appended to the second edition of the Principia in 1713, Newton wrote that he had not been able to discover the cause of gravity from the phenomena, and "hypotheses non fingo" - I frame no hypotheses. He said plainly that hypotheses, whether metaphysical, physical, based on occult qualities, or mechanical, have no place in experimental philosophy. He gave the mathematical law and stopped there. He declined to say what gravity is or how it propagates.
And here's the part that matters for your argument: Newton wrote that passage specifically in reaction against Descartes' and Huygens' vortex theories - the Cartesian mechanical aether. His contemporaries went after him for it. Leibniz accused him of dragging occult qualities back into natural philosophy precisely because Newtonian gravity had no mechanical cause behind it. The Cartesians were on one side. Newton was on the other.
So when you write "Newton actually was standardized finally mechanistic cosmology," you have the dispute upside down. Newton was the target of the mechanists, not their standard-bearer.
Fatio and Le Sage were fixing Newton's gap, not extending his framework.
Fatio's 1690 work and Le Sage's later development were attempts to supply the physical mechanism Newton had refused to give. They were answering the same objection Leibniz raised. They stand on the opposite side of Newton from where you've placed them. That's the whole reason the pushing-gravity tradition exists in the first place - it was the mechanical answer to a mathematical law that had no mechanism behind it.
Kelvin unified atomism and aether. He didn't oppose them.
You wrote that "mechanistic cosmology is tied to atomism not aether as workable." But you named Kelvin yourself in your own list. In 1867 Kelvin proposed the vortex atom - atoms as knotted vortex rings in a perfect fluid, which is to say, in the aether. He built matter itself out of aether dynamics, working from Helmholtz's theorems on vortex motion and Tait's smoke ring experiments.
Atomism and aether weren't rival camps the way you're describing. Kelvin's atoms were aether structures.
And the aether wasn't set aside for the reasons you give.
You say it was rejected because its dynamics in a Cartesian closed system came out chaotic rather than fluid, and atomism was enacted in its place. That's not what happened. The aether fell out of mainstream favor after Michelson-Morley in 1887 and then decisively after Einstein's 1905 paper made it dispensable for electrodynamics. Atomism was independently confirmed in that same window by Einstein's Brownian motion work and Perrin's experiments a few years later. Two separate developments with two separate causes. Neither one is the story you're telling.
So here's where that leaves your argument.
Your objection to @GeorgePlymale2's post was that these models are mechanistic Cartesian holdovers and therefore not worth engaging. Every load-bearing piece of that objection turns out to be historically backwards. Newton wasn't a mechanist. Fatio and Le Sage weren't Newtonians. Kelvin didn't oppose aether to atomism - he made one out of the other. And the aether's fall from favor had nothing to do with the mechanism you named.
You dismissed a post based on a history that didn't happen.
Which brings us right back around to where this started. You didn't read the post, you pattern-matched it to a label, and the label was wrong. Same as with the Kinderhook plates. Same as with Schnoebelen. Same as with Jay Dyer.