If you buy Call of Duty: Infinite Warfare on disc, Activision are bucking the recent trend of sending a download code in a box. Oh, you'll get the disc. You'll be knee-deep in the disc. In fact, even if you want to play Modern Warfare Remastered, you'll still need to insert the Infinite Warfare disc.
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If you download the game - like an ordinary modern human who doesn't like leaving the house for things - then you won't have this problem. It seems like it might be a tactic to prevent people buying the double-game bundle and trading Infinite Warfare in, holding on to the classic shooter remaster.