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A much more sensible approach is: "the rules should be simple, clear, and have unambiguous interpretations."
2.8.3. If a computer player has upgraded monsters of levels 1, 6, and 7 in the Conflux or level 4 in the Necropolis, then they are prohibited from upgrading their troops of these levels and hiring the upgraded version of creatures. If the Necromancy Amplifier has been built, then vampires are prohibited from being upgraded, and additional skeletons do not need to be disbanded.
2.9. It is prohibited to collect the composite artifact, the Shroud of the Dead King. All other composite artifacts can be collected.
It could simply be written concisely that
it is prohibited to upgrade and hire monsters of levels 1, 6, and 7 in the Conflux and vampires in the Necropolis.
It is prohibited to use the composite artifact, the Shroud of the Dead King.