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You got it backwards:
Pixel artworks are digital mosaics.
Six of one, half a dozen of the other.
Not quite, pixel art is just a subset of mosaics.
So every pixel art is a mosaic, but not every mosaic is pixel art.
So in other words OP was right in the OP?
… no?
For a traditional broadcast redrawing every pixel per frame, definitely. Is it still a mosaic when compression algorithms prevent redrawing certain sections though? Does it then become mixed media?
Not really, mosaics have far more shapes than just squares, and they’re not usually arranged in a grid either. Have you seen actual mosaics?

FWIW, pixels don’t have to be square or in a grid.
Some professional cameras take photos with hexagonal pixels, for example


