No reputable researcher that has published a peer review have given this mutation an official name, you will not find any reference of a "Shredder" mutation on old or new genetic books(about chickens or fowl), it has been reference as "Wing Patch" by Jeffrey (1985) it has been known to be...
I would NOT breed birds with the Lavender Wing Patch(bad quality feathers) genetics, it's not the shredder mutation, but it's considered a closely linked gene to recessive autosomal lavender