Windows service packs have never included drivers as standard issue. They might have new drivers and you can get them through the update site but they’re not in the SP unless the shipping drivers actually cause crashes, and that would only be a replacement not adding new. And there’s a good reason for that, people already whine the SPs are too big, how much bigger would they get if they added a bunch of possibly not needed drivers.
Windows XP drivers, regardless of SP - 2001
Gee, someone needs to tell Microsoft that. They seem to be under the impression that there are drivers on the SP CD.
On the other hand, they seem to like to delete drivers during the SP install, so that could be the cause of the article writer's problems.
Although, why Microsoft would just quietly delete the network driver for a widely used network card without warning the user is beyond me.