That could be possible.Maybe frozen is just some patented name for BMWs version of matte? I'm not really sure. Sounds like a different name for the same thing to me.
Since June 2010, certain BMW models are painted with “Frozen” or “Matte” exterior paints. With the launch of the all-new BMW 6 Series Gran Coupe, a Frozen Paint was released for the first time as a factory option.
This two-stage paint process consists of a color base coat, followed by a specially formulated matte finish clear coat.