Rather than stepping into this argument, I'll refer you and anyone interested to this debate.
Essentially, the counter-claim is that the other side confuses Special Relativity and General Relativity and interprets the speed of light under the Lorentz Transform instead of a vacuum.
I must head out now but will check back later this evening.
I should have mentioned that the Tom Roberts on the earlier link Experimental Basis of Special Relativity is evidently the same (Dr.) Tom Roberts in the debate linked in the previous post.
For a more direct confrontation between Dr. Tom Roberts and Dr. Cahill (who evidently uses the posting handle of "Peter") click on this debate.
I think these are the correct bios (the conflict between areas of interest and research should be apparent:)
Dr. Tom Roberts
Dr. Reginald T. Cahill
Of course, Cahill's observations and theories are predisposed to his own process physics which is like a "new kind of science" (or paradigm) akin to Stephen Wolfram's. In that regard, you might find the discussion on Wolfram's forum also interesting.
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