No, no. Mutiny Within is not at all nu-metal. Nu-metal is far more simplistic and relies on big rock and hip hop beats, basic dynamic shifts, rapped/screamed vocals, simple melodies, pop song structure. A de-emphasis on virtuosity. A commodifiable image of juvenile deviance.
Here's some nu-metal:
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There's a bit of metal in the chunky guitars, it has similar sonic characteristics, it's even got some of the same lyrical themes... think of it as abrasive pop for angry kids.