Comet 3I/ATLAS is not expected to get very close to Earth; the closest it will come is approximately 1.8 astronomical units (about 170 million miles or 270 million kilometers)
https://commons.wikimedia.org/wiki/File:3I_ATLAS_animation3.gif
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Never heard of that. I get early measurement of light speed being sketchy and difficult, but lightspeed decay would require the electric permittivity and magnetic permeability of pure vacuum to be fundamentally variable... or require an entire fundamentally new theory of electromagnetism.
Yeah the entire construct is bullshit, a nice little hypothetical stopgap fudge factor of "we don't know why our measurements don't line up with our theory, but we'd rather have a placeholder than go back to the drawing board."
I have seen some interesting hypotheses and models that match observation and theory without dark energy bullshit, the most intriguing one being something so stupidly obvious it's unbelievable someone didn't think of it earlier -- if you set the universe as a rotating system rather than linearly expanding one, the measurements line up without any bullshit factors. But that's still very much a work in progress.