I feel really dumb. But I have analysed this AnimBP (as pictured in question) for a while now, and in all three pages I don’t see any reference the specific Animation Sequences.
The entire thing seems to determine if the player is grounded, and then set the two variables.
Within ‘Details’ of the actual player blueprint instance in the level, I see it is set to “Use Anim blueprint” with that AnimBP attached.
But how is this doing all that magic making him fully animated for walking, idle, jumping etc.?
EDIT: Ooops! I found it. I had to click “AnimGraph” in the panel on the left.
Its a shame to be limited to this visual approach only but I think it will be nice once I get used to it.