You're assigning your own meaning to those terms which is not inherent in their definition.
Leaving aside that the correct term for this shape is a sector (a cone is exclusively a three-dimensional shape, not two-dimensional), since I've already lost the office fight for correct geometric terminology; areas in the game are defined by their shape -they frequently spread the damage to things in that shape out over time, and that doesn't change what the shape is.
Ice Nova's damage is still dealt a circular area, even though it doesn't deal all that damage at the same time, but spaces it out based on distance from the player.
The damage pattern of Ground Slam is directly equivalent to this skill - you seem to be trying to draw a distinction entirely based on visuals (the fact that the spikes at one end of the damage area are still visible at the same time as those at the other), which is not at all how anything in the game is or will be defined, because those ha...
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