Uh, yeah, nobody actually said that Meshuggah plays nu-metal, merely that some of the riffs (actually, many of the riffs), combined with their arrangement and use in the songwriting process, as well as the guitar tone and other factors, resemble traits of nu-metal, aesthetically more than anything else. Obviously Meshuggah is more technical, aggressive, (generally) faster, and nuanced than most nu-metal, at least that I'm aware of, but that doesn't mean it can't bear a resemblance.
You either have no idea what your talking about or you are clinging on to whatever pathetic comparison you can for arguments sake. Like i said before, the only possible comparison to nu metal is low tunings and the use of heavy repetitive riff based structures. You have not put forward any other comparisons other than the riffing and guitar tone. Sure you wrote its the arrangement of the riffs and the use of them in the songwriting, but that is a complete load of crap. Meshuggah have more in common with progressive metal structues than they do with the hip hop style of songwriting like limp bizkit or linkin park.
If you have a personal dislike for meshuggah, fair enough, but enough with the lame ass nu metal comparison.