Huh?
Where do you see that he was diagnosed and being treated for Prostatic CA?
They announced it just now.
Or are you saying that they diagnosed this (late) a year or two ago, and didn’t tell the public, and that he was getting treatment.
I doubt very much that any treatment would have caused his dementia.
Metastatic Prostatic CA can rarely go to the brain with symptoms. But rare.
The dementia associated with Biden's Androgen deprivation therapy (ADT), prostrate cancer treatment, was confirmed by prostrate cancer surviver Dr. Drew Pinsky on Martha McCalllum's show, today, on the Fox News Channel.