“The Chief Justice does not have the authority to decide which questions are asked.”
Correct. But he can and did refuse to personally read it. The Senate ultimately decides, and I hope they do expose all of the cockroaches.
At first Roberts did not want any questions about the whistleblower. Later changed it to not allowing whistleblowers name. Reason was Republicans were furious. They were going to have a vote to rebuke Roberts on the record.