What would make you trust an AI visibility number?

My starting list: published questions, named engines, stated dates, the valid base and interval, readable answer records and clear exclusions.

I also want to know who reviewed the answers and what the measurement cannot establish. A precise number can still answer the wrong question.

What is missing? If a report met this list, what would still stop you from using it for a decision? One check and the reason for it is a complete answer.