I'm afraid that I don't really follow. I get the impression that you are working on the assumption that BiaB automatically creates your song somehow. (It can, but that's using a more complex approach called the Audio Chord Wizard)
From watching your video at 13:14, I think you expected BiaB to automatically create the song, without entering any chords.
I confess I only watched sections of your video, at almost 40 minutes long, with much digression, it challenged my attention span.
_____________________________________
In BiaB, you select a Style, and type in the Chords to your song in each Measure (Bar), and it generates an audio output song file.
Try watching these videos which should be helpful: