That is sufficient.
Yes it is. The unaspected cast animation is white with rainbow effects. The fact it doesn't have those means it's not unaspected. Seeing as fire is red-orange (same as its element's icon), aero and cure are green (same as wind's icon), earth spells like Summon 2 and Summon Selene are orange (same as earth's icon), blizzard's a pale blue (same as the ice icon), and thunder's a purple (same as lightning's icon), then vercure, which has the same hue of blue as the water icon, is water-aspected by process of elimination.Mate I think they just chose to have it be blue, that isn't proof that it's aspected.
Red Magic is birthed in the Calamity of Water. Their entire lore is that they exist to oppose future calamities, as a response to the most recent one before the Seventh. It makes sense that such a group would take the same aether that was used to cause great destruction and death, and turn it to a curative force that restores life. That magic, above all else, would have been the magic they used most common and most often; and the aether type they had in purest abundance and imbalance.And if they did choose to have it be a different aspect than Cure so it's not actually descended, then there's nothing keeping them from Verwater now, is there?
As an aside: Astromancy was developed by Sharlayan, and Sharlayan originates from the same events and the same camp of refugees that formed Red Magic. The Red Mages were the ones that got off the boat at Gyr Abania (the boat is still there) and the Sharlayans got off later. The curing magic tradition used by Sharlayan -also- uses water-aspected curing. Their patron diety is also water-aspected, Althyk, and the ruins of New Sharlayan are over-aspected in water-aether.
Which makes them physical attacks.
If I summon a sword of ice, and I stab you with it, leaving gash after gash with the sharpness of the blade, puncturing you till you bleed, that isn't damage caused by cold, any more than if I pick up a rock and beat you over the head with it, will you start taking earth-aspected magick damage. That weapon you got from titan is most certainly earth-aspected and fashioned through earth-aspected aether. The wounds it delivers are physical, not 'non-aspected' magic.