I have no answer, but...
No such O/S as XP Home Premium...it's just Home or Pro.
When I went to the MS documentation on the update mentioned, the website clearly indicated that it is not for XP.
Windows Update has a history of problems. I have seen valid XP updates which reflected a 0 size and zero content. I didn't think anything of it, since I've known long how things constantly go wrong...a file which has no size nor content nor deliver time...did not seem to merit much thought by me
I don't use auto updates for XP (I do for Win 7) but auto updates has a whole litany of issues (which is why I don't use it, I just go to WUS, look, and update).
You may want take a look at http://answers.microsoft.com/en-us/windows/forum/windows_other-windows_update/updates-not-updating/78396220-9d08-43da-a4da-7b91cefc08a5
. The Mirosoft Answers forum seems to field a lot of issues about such things and is probably a good source of info for many users with questions about Windows topics/quirks.
If Mr. Dyer (P.A. Bear) cannot answer it...I sure can't and his guesses are a lot better than mine