I just listened and what I saw was theory written below the video, i.e. Amb5 etc. Again I still believe one should learn to play their instrument with theory and not fake it.

If one want to learn passing chords I would suggest some approaches that I myself use.

Study the jazz classics. There are some very interesting chord progressions in them.

Study chord substitution. For example substitute an Cmaj7, Am, or an Em for a C. Tritone substitutes are one progression to learn.

Try all kinds of chord progressions in BiaB. This approach I like and use a lot. It's immediate feedback.

Look for half step resolutions. This is an important one IMHO.

Also look for similar notes in passing chords, for example C to Ab to Am7 to D7 all have a C note in them.

There are a lot of free things that you can do and after listening to the passing chord video I think this is a money rip off. YMMV

PS - have you tried the ultimate passing chord, as named in a guitar magazine? It is a Caug/Gb. Yes that is C-E-G#-Gb. this is a perfect passing chord leading to a Fmaj7!

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