Thanks for your last reply. It appears that Exporter Pro does not support translating the 'msDS-userpasswordexpirytimecomputed' into an actual date. We will fix this on the next update.
As for the 'pwdlastset' vs %SYM_AD_PWD_AGE%, I copied all of the accounts with a pwdlastset and the value of %SYM_AD_PWD_AGE% into Excel, and created a new column with the formula =Today-A1, and the results we the same as our calculation, rounded up or down accordingly.
I also checked and in Hyena v8.8 the calculation has not changed. The 'pwdlastset' is coming directly from AD, and Hyena bases the calculation of the password age based on the same attribute value 'pwdlastset'.