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Personally I'm skeptical. Really skeptical actually. I've incubated colubrid eggs at those temps, and lower, and never hatched 100% females.
It just seems odd to me that with colubrids being heavily bred for the last 25 years or so that this would just now be discovered.
The problem is snakes have sex chromosomes whereas species which are known to exhibit TDSD do not. The sex of a snake is determined genetically just as with humans. However, with snakes it is the female that determines the sex of the young, in humans it's the male. This is because in humans males have dissimilar sex chromosomes (XY) while in snakes it is the female that is dissimilar (ZW).
If he has properly sexed the offspring though, and has actually hatched all those clutches being entirely female, then I can't explain it. I do not accept TDSD out of hand though.
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