What triggers ardent censer?

So I recently played lulu and discorvered that her ult, e AND w trigger the ardent censer active. It says only heals and shields can give someone the ardent buff so I'm a bit confused? I also tried it with nunu w but it does not work. So why does it work on lulu w that gives attack speed and movement speed but not on nunu w that gives %ap, attack speed and movement speed?

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