Portmanteau :
"join right downwind to runway 20" followed almost immediately by " right downwind runway 02". Confusing or what?
Not if you put the things back in their context . The second instruction is a correction to the first, and it is that one which is acknowledged back by the Capt later. The Capt requested and confirmed 02 until that point remember , and the controller aim at that point was to try to bring it back in the (VFR) pattern for 02 behind the others.
You have to link the R/T exchange with the behavior and position of the aircraft as seen by the Tower controller at the time of the transmissions to understand the situation.
Things will become much clearer hopefully once we see the preliminary report .