I've been wondering about this too - specifically in how it tracks my two different cards.
I have a plat biz and a plat personal.
I've written to DL and am waiting for the nonsense reply so I can send it back and get a real answer.
I'll report back when/if I do.
In practice though, all this only really matters if you're trying to bump up from where you are this year, right?
I'm PM, so none of this matters until I hit 125k and either spend or waiver.
Are a lot of people at that a bump up point already? It's pretty early in the year...