Exactly.
I don't think the DLC Depot Names mean anything. Maybe those are just the Names they gave them a while back, where they haven't yet decided which Leaders to release first. And as we know, most DLC Depots pre release had Names mostly unrelated to the Final DLC Products. Besides, if we go with LP as "Leader Pass" and GN and J as the Abreviation for the Names of the Leaders in those DLCs, LPJ would mean we will only get 1 Leader in that DLC, and GN would mean it's either 2 Leaders or a Leader and a Wonder. I highly doubt that we'll only get DLC with only 1 Leader in them, even 2 are too few if it's just Leaders that we will get.
So, FWIW, they can be Abreviations for anything if you ask me. But I guess, we'll find out soon ^^