atma drop with zenith+ state weapons

[Maero]

You can get atmas with anything above zenith as well. Maybe you have been farming a zone that has no atma.

That is indeed false, the quest has stated that a Zenith Weapon needs to be equipped in order to get an Atma.
Alexandrite Laysa is correct you can get those with Animus and Novus as well
And the drop rate is being increased to double, so that means like 2% now