The way he does it in the video is to send CC54 first then the PC second all using one foot tap.
I’m not sure why he doesn’t setup to constantly record but I “think” he goes over the reason in the video. I believe it’s so he doesn’t immediately have to flip back to the playback pattern or risk overwriting the buffer. Basically, if he wants to record into Flex 1 he cues up Pattern 2 (I don’t know why he didn’t make Pattern 5 the playback pattern and Patterns 1 through 4 match up with the buffers), plays what he wants looped, then he can flip back to Pattern 1 when he wants. If it were not a one-shot recorder and constantly recording, it would overwrite the buffer if he didn’t flip patterns quickly enough. He’s also micro-timing the recorder trig slightly ahead of the playback trig.
Worth the few minutes to watch the method. Might not be anything new to a veteran like yourself 
I thought it was a neat way to organize a loop-based project though. 
