It's just the rotation since 2002, the Colts worst season ever just happens to fall right before their division was up to play the AFCE.
For those unsure of how the rotation works, since 2002 it has looked like this:
Your division x2
AFCx Division x1
NFCx Division x1
Opponent who placed the same as you from AFCy/z (or NFCy/z if you're an NFC team)
The next season it will be AFCy and NFCy, followed by AFCz and NFCz, if you're AFC the rotation restarts and you play the final NFC division a long with the first AFC division you played in the rotation. If you're NFC you'll play the final AFC division and the first NFC division you played, etc.