Don't like to suggest you're wrong,but I doubt whether MS would even have a mailing list for all affected XP users and you absolutely can hide and restore updates at the Microsoft Update site when using XP.
Just put checkmarks in the "Don't show this update again" box. (Note: you must click on the + next to the update to expand the entry and display the Don't show this update again option.
To restore put a checkmark in the box next the the hidden update.
The Change settings option is the selection to switch from Microsoft Update to use Windows Update only.
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