That code has worked for me for years and still worked today.
Sometimes they show up immediately, but sometimes it’s hours. It really depends on Google.
Have you enabled ecommerce tracking on the Analytics side as suggested in the article? You said you did, but maybe double-check?
Or maybe none of these have fired yet?
s2Member will display your Signup Tracking Codes in one of four possible locations… 1. If possible, on the Thank-You Return Page, after returning from your Payment Gateway. 2. Otherwise, if possible, on the Registration Form; after returning from your Payment Gateway. Note. If you offer a 100% free Trial Period, Tracking Codes will be displayed in location #2 when using PayPal Standard Button integration. 3. Otherwise, if possible, on the Login Form after Registration is completed. 4. Otherwise, in the footer of your WordPress theme, as soon as possible (immediately with s2Member Pro-Form integration) ; or after the Customer’s very first login.