When I first installed SP1 RTM through windows update I hadn't installed KB971033 beforehand, and as
such I didn't have any option to remove it after installing SP1.
I reimaged the drive, installed KB971033, then SP1.
After reboot, Uninstall of KB971033 was available, and done.
According to the docs
it seems SP1 includes that update, so if you want it gone (or seemingly so), I guess this is the way to do it as now that update is listed as available in WU.