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There will obviously be a correlation between tread depth and usage time + IV exposure. Meaning, observing a correlation between tread depth and traction does not mean that the relationship is causal. The real cause is explained above as time and IV exposore, which I assume result in the hardening of the compound, with references to test results that negate the role of tread depth (as long as it not more than 5/32"). In other words, it seems like they have done the testing to prove that tread depth (as long as it not more than 5/32") is not a significant cause in the reduction in traction.
They say that tread depth comes into play as a significant cause only if you have more than 5/32" tread on a street tire, and yes, they are saying that you will indeed have significantly less traction if you have more tread than that on a street tire you are pushing on the track. (That was the reference to "chunking" and "overheating" in my previous post).
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