Testosterone * X = DHT => Hairloss.
Then whether you reduce X (using Propecia) or if you reduce Testosterone (using other methods), you will reduce DHT, and in turn Hairloss.
It doesn't matter the method by which Propecia accomplishes this. Whether it reduces Testosterone or reduces X (the 5AR conversion factor), the result is the same. Lowered DHT.
As has been said a castration would result in drastically lowered testosterone and therefore DHT. But you seem so vehemently convinced that it's not, I'd only be led to assume that you have personally tried this yourself!

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