Direct from Terry in that thread:
"reb03, I have customers running BMW5w30, M1 0w40 all with the same effect, the wear control is good if we change the oil at 1000 mile intervals but the deposit formation from REAL volatility issues are slowly damaging the engines. I just worked a 07 335 Biturbo yesterday USING ASTM lab tests on the used oil and M1 0w40 went from VOA flash of 430+F to 280 F in 1150 miles, oil sheared to 12.1 cSt and fuel was at 1.99% by IR. Amsoil has not been tested in this engine yet. Because Amsoil is a traditional based PAO I predict similar results to the M1 0w40 which is still one of few M1 products that can perform reasonably well. "
* * *
"RLI BIOSYN is the only oil I am seeing work well in DI RS4 or 2.0 Audi or the BMW bi turbo 3.0 I6 in the 335I. They both are killing every oil I used to recommend. I am not kidding and have no interest in promoting one oil over the other.
reb03, the M1 0w40 should not be run longer than 1000 miles to be safe."
I think when Terry Dyson recommends that an oil not be run longer 1,000 miles "to be safe", the inference is that it is not safe to run it longer than that. That meets any reasonable definition of "shot" that I'm aware of.
An oil with a 280F flash point and 2% fuel dilution is absolutely "shot" in a turbo environment, AFAIK.
BTW, I never said "shot". But I won't quibble over that.