Skins from The Aztec Collection are not obtainable through the weekly drop.
The Aztec Collection is a Valve-made collection of CS:GO skins introduced on 14 August 2013. The collection consists of 3 consumer skins, 2 industrial skins, 1 mil-spec skins, 0 restricted skins, 0 classified skins, and 0 covert skins.
The Ancient collection is arguably the spiritual successor to the Aztec collection which was introduced in 2020 as part of Operation Snakebite.