Mike, I had to stop watching when you got to the part where you had the RCA-to-1/8" adapter connected ... you kept putting your hand over the mic (hard to hear what you were saying) and it was sideways (don't record ANYTHING in portrait mode; turn your smartphone SIDEWAYS to record in landscape mode!).
First and foremost, that jack on the front of the mixer is an INPUT not an output.
Second, the DJM-T1 has a built-in soundcard and you can use it to record back to software via the USB.
Within Audacity, set it to record the inputs from the DDJ-T1 USB5/6.