If I recall correctly, 10.2.7 was ONLY for the G5 PowerMacs. It was when the G5 was released, so they made 10.2.7 the exception for public release for other machines. So if you had a G5, it would have shown up, but since it was G5 only, you won't see it in the updates.

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Actually it was never made as a software update for the G5s - it shipped with the G5s, it had to, as no prior OS had support for either the G5 chip or the new hardware in the G5s. No G5 ever shipped with or ran 10.2.6, or any OS prior, hence the reason for 10.2.7 existing in the first place.