No, it is still vaguely defined because the two-parents rule used in this statement was no longer current even in the days of George III. A child of an Englishman abroad was a subject of HM the King, no matter who was his mother.
Besides which there is no case law here vis the constitutional test. You could make this argument but I doubt a court would agree with your application of original intent.
Yep it was a sexist world back then, but Obozo’s daddy was a british subject and that makes him a british subject. You have to make a positive statement to reject British citizenship.
A country that won’t allow dual citizenship has no affect on British status if it grants its own citizenship unless that British citizenship is overtly denied in a manner that Britain recognizes.
Citizenship is through the father in 1800. Obeyme’s is Kenyan.