That physical versions of Nintendo Switch 2 Edition games will include the original Nintendo Switch game and its upgrade pack all on the same game card (i.e. they are exclusively Nintendo Switch 2 game cards, with no download code). Alternatively, some publishers may release Nintendo Switch 2 Edition games as download codes in physical packaging, with no game card.
That physical versions of Nintendo Switch 2 Edition games will include the original Nintendo Switch game and its upgrade pack all on the same game card (i.e. they are exclusively Nintendo Switch 2 game cards, with no download code). Alternatively, some publishers may release Nintendo Switch 2 Edition games as download codes in physical packaging, with no game card.
I think this statement is not really clear. There is no text about download, we now the original game is on the card. But does upgrade pack mean the updated data is on the card of only the key to get the upgrade pack. Because if have read different things from different sources. The source from this article as well, but still thing this statement is not clear enough.
"exclusively Nintendo Switch 2 game cards" as meaning its the new red S2 game card format.
"include the original Nintendo Switch game and its upgrade pack all on the same game card" as meaning that the base game has been patched with the NS2E upgrade and the result written to disc.
Of course if any post release patches that occur may need to be downloaded but their apparent intent has been to provide a version that is playable from gamecard.
This sounds like the best implementation with the exception that the base game is not playable on S1 consoles (something you could do of you bought it digitally).