Who was? They're just talking about how it was ahead of the competition. Those enhanced capabilities could translate to better versions of the same games that were on the PS2 and GameCube and often did just that. And it could also directly benefit the games and make them more enjoyable such as the addition of online leaderboards to many classic arcade compilations on the Xbox.
So I don't think he was saying that it should be remembered for being first in those areas, but was just commenting on how advanced it was and that it would age better than the competition partly because of that (Such as much of its library being 480p and 16:9, making its library more suited for modern tv's than say the PS2's).
I'll remember a game like Project Gotham Racing 2 down the line because of not only how great of a game it was and how fun it was, but also because of the great times I had online with it through Xbox Live, racing with my favorite songs playing thanks to its custom soundtrack support, and the two great booster packs that it had which added entire new locations and extra cars to the game and extended its life several times.
All that was made possible by the advancements MS made over the competition a generation ago.