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Just wondering, why do you use 'their' when it's quite obvious that it's a man?

Singular their has a long established use.

Going by that page, AndrewDucker's usage of the singular their is incorrect.

Probably for the same reason you use 'it' when it's quite obvious he's a 'he', it's a more convenient and more colloquial way of phrasing something.

*EDIT: for tone & clarity

Not sure what you mean, referring to a person as 'it' is almost universally offensive, at least in the US.

Even when referring to a child of unknown gender? Or a fetus? In Dutch, those are acceptable uses for it (or actually "het").