When the presentation opened (North American on YouTube), it showed ESRB RP to T, and my reaction was “Huh? T rated Pokémon?”
Then the presentation gets to this announcement, and this is the one with a T rating. I was flabbergasted. I checked my original GameCube copy to be sure, and it was E.
Edit: After rewatching, the box art at the end does show E, but the rating in the lower corner at the start of the trailer is T.