[ZenSwordArts]

Although calling 1.e4 aggressive is kind of inaccurate there is some truth behind it. You could at least consider it to be active or ambitious :)

1.e4 introduces a quick development of the white kingside and also the center usually is opened very early in the game.

Still the article proves to be somehow unqualified in terms of chess with the following sentence: 'It’s an aggressive tactic, putting the bishop and queen into play.. '.

Usually it is not a good idea to develop the queen early on and certainly not the idea behind 1.e4.