Any other source for this info, or can someone quote it here or upload any images to an image sharing site? I can't access it since I don't have a Facebook account.
You should be able to see it without being logged into Facebook as well. Or maybe it depends on your country or local settings.
Anywhere, here it is from Mozilla without being logged in:

So if what you say is correct, that you must first transfer coins from your Ledger to the card before you can spend them
Yep, that should be the way to do it.
Unless they have come up with some shared custody type of account that you will have to set up. But I doubt it.