Cloud TPU product manager here. As I said in another thread:
The TOS you are quoting only refers to the information you provide in the survey. Here are the Google Cloud TOS: https://cloud.google.com/terms/ if you're interested in what Cloud does with customers data.
5.2 Use of Customer Data. Google will not access or use Customer Data, except as necessary to provide the Services to Customer.
Your training data and models are secure.