That line made me laugh so loudly!
To be quite honest, I don't think defining it as satire at the beginning was just to keep the "racist fuckwits" off their tails, but to keep so-called non-racist liberals and progressives watching. Without the disclaimer, I personally believe there would have been more than a few "non-racist" people who would tune out as soon as they saw the piece. It speaks to a passive bias many whites suffer. They are unaware of the treatment of others, even seeing news stories as inconsequential to perpetuating racial bias and hatred. It is "yellow journalism" at it's 'finest.'
I don't know if you remember the brouhaha back during Katrina when white people were "finding food" and black people were "looting food stores", but it is a very similar situation; how the "other" is portrayed is usually as "perpetrator" even when they are the victim (see: rape victims). When a black person is killed, we hear all the bad things s/he did in his/her life, when a white person is killed, it is a memorial service. This is a phenomena which I am sure you and most AA folk are keenly aware, but many white people are not!
This picture sums it up:
One would think in this day and age such bias would be very plainly seen as bigoted, and yet, it is not. It is a prime example of passive bias.