I understand that, but rather than note they are buying ore off...

I understand that, but rather than note they are buying ore off Authier for the blend, they intentionally said they are buying 100% of the Authier Ore Material. So if Authier is expanding past its current output, then only two things can occur.
1. Authier has a surplus of material
2. NAL PFS is lower than it should be as they are buying the entire 100% of Authier ore.

As per my post, it appears the previous Authier DFS has enough ore to supply NAL at capacity.
We also know that the NAL PFS figures incorporated those within the upcoming Authier DFS.
So while I get the reports shoe the minimum in relation to expected price, etc - the recent PFS didn't show us anything different in terms of Authier to the 2019 Authier DFS.

So the NAL ore calculations are what they show in the report, but the Authier ones are unknown (even though NAL are apparently buying 100% of Authier ore)

And that's what is confusing me.