In "6. Data Deletion" Google assures that data will be delete in a reasonable fashion upon request or on expiry of the term. Google reserves the right to share the data with other entities in "11.2 Information about Subprocessors" which are listed in [0]. I assume that the data will also be deleted from the subprocessors. It is also stated that the function is explained, yet an exhaustive explanation is missing. The most informative I can find is that they "provide customer and technical support" besides some non-exclusive examples of activities.

Also, I see no part that ensures Google won't analyze the data, like for example to train neural networks. Could you point me to it?

[0] https://cloud.google.com/terms/subprocessors