Yes, the graphics are confusing at first glance.
I know the technique from Astroplus. It's like a quadweel, only each person uses a different color for the planets.
This makes it easier to tell them apart.
With more than 4-5 people you get a bit confused.
But it is good for looking at the dynamics in small groups, families or work teams.
Christof Niederwieser has written a book about the technique and runs a YouTube channel.
Funny guy, but very competent.
Addendum:
To be clear, I used it a few times back then, but all the colorful information makes me quirre, so I left it.