Oh, I bought the AC3 base game. It was listed on the top there.
Oh, the Uplay requirement is not on the ACIII Deluxe Edition Bundle page.
It should've been, since all the pieces there listed below require it.
You have to click on the pieces that are included in it, which are listed down below in the "Also In this Bundle" Section - which all items linked from there, click on them and it has each piece using UPlay listed at the top.
Ah ha! Mystery solved (no pun intended... although... I don't think that's a pun). I should have clicked on something and checked, but I didn't think to. After all the trouble hunting for the deluxe version, too, when the standard was right at the top!