I have watched the video too and try to use the same format and do it again. However the panel shows nothing when i place X and Y attributes. i have checked the setting from the table calculation already, but it still doesn't work.
May i know why? Attached with the workbook. The problem worksheet is "test" page and i can't recreate the "sunburst" page.
Bora Beran likely has his hands full right now with Tableau Conference prep among other work, perhaps he'll respond after. However, have you tried asking on the thread you linked? One of the other users may be able to help out.