Mine also shows 0GB but waking it up by stepping on the brake to wake the car then shows 8GB. Expected since my build date was June 3, 2021.
Interesting that mine shows "Brake Package: Base" in addition to the other items. That reinforces that the CC brakes will only be available for the Plaid models.
Since mine shows 8GB I'll have to find out exactly what was upgraded when they told me they upgraded me from 8GB to 16GB. That will mean another trip to the SC since I cannot see invoices in the app prior to April of this year for some reason.