Did you know a lot of the japanese matcha is produced in china?

Well tea leaves mostly come from china

Yeh. Even some big companies in japan selling macha get it from China.

Why did matcha in the OP become macha?
and whut the fluff is it anyway?

Matcha is a special powdered green tea.

Not exactly surprising, no. I understand Indian tea (Darjeeling, Assam, etc.) are mostly turned into black tea.

matcha is super popular within the "west village" girl set