They would have needed a hell of a lot more camera for that, right? Even the best DSLR with the best lens is going to have a lot of trouble resolving something that small at over 4000 miles.

That's a detail a lot of people miss. Apollo missions orbited at ~150 miles above the moon while Artemis II fly-by was much further away. That was by design to specifically give them the wider view to see things missed by Apollo's closer orbits