Hi, David.
The image on that page was done in post since it was very difficult to capture a screenshot of a falling drop with any level of success.
Regarding the effect node’s position: I prefer to have the glow closer to the top of the drop to help the number stand out, which is why I didn’t adjust its position; but, yes, moving the effect node’s position—as you did—will more closely match the image in the book.
I may end up recreating that image, if possible. And I’ve updated the text to read:
Build and run the project, and you’ll see a faint glow around the top of each drop.
You’ll see this update in the next release. Thanks for letting me know.
EDIT: Good news! I was able to adjust the image. Thank goodness for source files and layers! 