Yes, I made a similar comment on the other mention today. The author seems to misunderstand what GR is / what it added to physics too (creating self-referential field equations to handle mass/energy equivalence - linear field equations without instantaneous 'action-at-a-distance' existed much earlier). The notion that it was a 'small signal' is totally false. Once you've hypothesized that the apparent mass of objects depends on the observer, you need to show that your theory gives consistent results for trajectories of objects in gravitational fields.
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