As context, you need to remember that Google deleted their "Don't Be Evil" motto and became a defense contractor. The customer will most likely receive a black box owned and set up by Google. That means they have no way of knowing if the system inside is phoning home or being remote controlled by an US government agency, or not. You can then say that the model is hosted in your own data center, which might make some people feel good, but using it with personal information is still a violation of the GDPR.
If Google, however, would make these boxes fully offline capable and I was also allowed to wipe all hard disks myself before returning it, that would convince me of their good intentions.