Isn't it fine...?
Not like I know what a Mozaik is or what Role it plays, but DECO*27 said "It's Mozaik Role!!!" on Twitter in plain English, and I trust him to know what he's talking about. (Than again, Hachi, Rangge Poppel, "P"oppelganger...)
There is a significant chance Deco really meant "Roll," though, given his tweet "I'll be honest, I've yet to eat a Mozaik Roll" and someone making a spirally roll and calling the "Mozaik Roll." So your Montblanc connection theories are indeed safe.
(Ignore the title in the video, it's with a Z. Zzzzz.)
Trio Amatou - comprised of DECO*27, akka, and mirto - translates to "Sweets Trio" or "Sweets-Loving Trio," but I prefer to call them... the Trifectionaries.
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Post Gumi songs here! Luvatorry Warning Curse Words!, Mozaik Role