You should note that that is from the "What to submit" section, which has no bearing on comments. In that regard this whole submission may be off-topic, but comments on a submission are inherently on-topic.

But also see:

  Please don't complain that a submission is
  inappropriate. If a story is spam or off-topic, flag
  it. Don't feed egregious comments by replying; flag
  them instead. If you flag something, please don't also
  comment that you did.

Just flag and go away from the submission.