Well, that comment from CyberMario ends with, "From - sevinPackage" which makes me think he's copy pasting something from another user who says they've worked for Nintendo.
sevinPackage, stylized as such, does exist and is a game developer. Personal Twitter and sevinPackage Games Twitter. A quick skim can neither confirm nor deny that he worked with Nintendo or Rare, but I haven't the time at the moment to truly go digging.
https://mobile.twitter.com/sevinpackage
https://mobile.twitter.com/sevinPackageG