Controversial issues and their resolutions.

Besides, the ban on the amplifier wasn't initially conceived through the vampire upgrade, but to reduce the number of revived skeletons.

Information from the rules author would be relevant here, but I think the vampire upgrade is a more significant imbalance than an extra 10% to the number of skeletons from the amplifier. So, at the very least, both were recognized as imbalanced.
A level 12-21 vampire on level 121 is quite a powerful unit.
And 300 or 330 skeletons make practically no difference.

Logically, in the above case, not only is it forbidden to build the vampire upgrade, but also to remove (10%) the extra skeletons raised due to the amplifier built by the computer.
But formally, "according to the rules," let the judge decide.