The personal information you need to register in order to obtain an Expo ID is as follows.
(Required Fields)
Name, email address, telephone number, date of birth, country/region of residence ("other" and "prefer not to answer" are options), prefecture ("prefer not to answer/NA" is an option), language preference.
(Optional Fields)
Gender ("other" and "prefer not to answer" are options), and email subscription preferences.
Thus, you do not have to register all the personal information listed in the Privacy Policy in order to obtain an Expo ID.