I don’t think they share much with Biden...and certainly nothing they know he could let out they don’t want him to.
With his cognitive issues he can say anything ‘without notice’ so they have to limit his exposure to the public. Photo ops and very brief mentions are about the it of it.
The rumor was that Slow Joe insisted on pulling out of Afghanistan in the catastrophic way he did, throwing a real Alzheimer's fit, in spite of everybody around him trying desperately to talk him out of it.
Is it any wonder they now keep him in the dark?