The way Rumer chose to write the announcement seemed a little confusing to me.
The way it reads is that aphasia is causing other problems, when generally, aphasia caused by something else.
Perhaps it is too painful to discuss, or they prefer not to use certain terms in order to protect Bruce, not sure.
What I have seen is it’s dementia & he has been dealing with it for quite awhile. Has used things like earpieces & voice overs to help lines. He just turned 67. It’s sad. Hard enough to deal with this stuff with a very elderly parent. Makes you pause when you realize it is happening to people just a few years older than you.
Looking back at some recent articles (via a quick Google search), there do appear to be some concerns for Bruce having dementia, as reported by people who worked on his numerous recent movie sets. If that’s the case, eventually it will become evident. Very sad all around, and certainly many

for him and his family, but whether this was intentional or not, it would probably be more helpful to just say the actual cause if you’re going to make an announcement, rather than confuse people. This is something many people deal with - I had a friend die in her 50’s of dementia, as well as a beloved aunt at an older age. There is a lot to be learned about early stage dementia; maybe it would help people recognize early symptoms, etc. (Though admittedly, no one ever wants to believe that could be the case.)