I don't know why they're reporting again about Miller not giving info. This isn't new insight. It was all already reported after the combine. On May 23rd Givony and Woo wrote on ESPN+:
Team executives present at interviews said Miller arrived holding a legal brief written by his attorneys informing teams that he will not be able to comment on specific details regarding the shooting.
Teams that interviewed Miller in Chicago have privately expressed some concern regarding fallout that might still come in the form of a potential lawsuit or follow-up investigation with yet-to-be-released details and were hoping to get more information directly from him.
Miller was also asked by reporters at the draft combine about what message he was hoping to convey to teams regarding the shooting, and he said the following: "The message I've presented to them is just it's all a lesson learned. You always have to be aware of your surroundings and know what you're surrounded by. I feel like the night could've changed my career in less than a heartbeat. So always be aware of your surroundings."
Jackson (his agent) reiterated there is no pending investigation into Miller, he did not break any laws and that he is "free and clear" of any wrongdoing. "The case is still open, and Brandon has had limited communication for that reason," Jackson said. "He's been cleared from day one. We were told by the attorneys not to speak about the situation. At the right time we can have that conversation, but for now, we're leaving it alone and will let the process complete itself."
-- Jonathan Givony
There is nothing new in yesterday's "news". 
Miller's agent points out that Miller was cleared by the police and has not been charged. From day 1 he has been characterized as a corroborating witness not a suspect.
I am not absolving him of anything I am simply pointing out that there is nothing new about recent "news" that he is stonewalling.
As previously posted, the Hornets are doing their due diligence "Charlotte is planning on sending its attorneys to Tuscaloosa this week to conduct their own investigation into Miller's involvement in the Jan. 6 shooting, Jackson told ESPN, and Miller plans to fly to Charlotte in mid-June for a workout and follow-up interview."