If screen record captures the audio then AUM wouldn’t be needed in this case since he just wants audio and video of the patch running.
Screen capture captures the audio in mono (unless you loopback to feed the audio output back into the input). When I use screen recording and want stereo in AUM, I usually record the master output in AUM when making my screen recording and then import its audio into my video editor (I use LumaFusion) and line it up.
Also note that when doing a screen recoring, the audio is sometimes up to 2 seconds out of sync! So, you often need to adjust the sync in your video editor. Fortunately, it seems like when it is out of sync, it is by a constant amount throughout the recording.
Wow that track/patch was fire.