High risk
Most of the assessment is unanswered. That is not proof the vendor is bad, it means you cannot price the risk yet, and signing now moves that risk onto you.
Next steps
- Send the unchecked items as written questions with a date for the answers.
- Renegotiate before signing: data location, training on your data, notice before model changes, export on demand.
- Walk away if the vendor will not commit to data handling and exit terms in writing at all.