If you follow the link (click on the 'Lore' tab then 'Dialogue') you can read the rest of the explanation that explains how the cards are supposed to work. (I did copy the whole thing initially, but it went over the post size limit and I was in a hurry.)

It's probably worth looking at the closing lines of the other quests as that is when you normally learn a new spell and they give some lore information about what it's supposed to involve.

Also worth noting: crafting ingredients for star globes call for the same "enchanted ink" used for arcanist grimoires, which gets explained in the alchemy questline as being an aetherial conductor. (Though not clear if you use it on the globe itself or for making the cards - or indeed whether you get new cards with each new star globe or keep your old deck - though personally I'd think you would keep it.)

I can't get quotes right now but will find it later.