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First, the skill "Starlight Illumination" is not a Dark Series skill, but a Starlight Series skill. Moreover, it is not a spell that requires casting time; instead, it's a Channeling Spell with a Reverse Countdown.
As the name implies, a casting spell requires a casting bar to be filled before the spell can be cast; whereas for a channeling spell with a reverse countdown, the progress bar dwindles, taking effect at the very start of the cast and continues to do so until the countdown ends.
Therefore, no matter how you look at it, the skill "Starlight Illumination" should not have triggered this talent.
But who knows how the underlying code of the game is programmed? Perhaps the programmer was lazy, and because the skill and the talent belong to two different professions, they did not make a particularly clear distinction or restriction.
