Hmm ... nah. I know too many men who have voices with the same pitch and tenor as Michael, and as far as I know, they are still "fully equipped." (Two who come to mind are also professional drag queens - and damn good ones. I sometimes do music arrangements for them.)
In any case, MJ's high tenor voice did not have the unnatural quality of castrati - think of a boy soprano, and that's more what castrati sound like.
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