Sent a request to join the Facebook group! I live in Ottawa but I try to get down to Toronto as often as possible since all my visual kei friends are there.
Their Taiko drummer, Shakuhachi player and guitarist do have Vkei cred. Kurona and Daisuke played together in CrowXClass, which did call themselves Visual Kei. Machiya (I heard he goes by Omura now?) Used to be in some Vkei bands before starting m:a.ture, which Wajow from The Gallo was also in.
I think the main reason they're not considered Visual Kei is just music industry stuff. A lot of Vkei artists are inclined to deny being Vkei because of the image Vkei has.
I would say that unlike other "semi-visual" (as I call them) bands, such as Unlucky Morpheus, Wagakki really tries to just sell itself as mainstream J-Rock. Afaik, they haven't really put anything Metal out in years, and whatever Vkei looks they were serving, they aren't really anymore.