What did President Obama know about his Vice President's corruption? Was his late personal chef willing to talk?

And when did he know about it? Or was President Obama blind and naive?

How  and how much was he a beneficiary?

Without the cooperation of President Obama, the value of the Biden "brand" would have been much less!

Perhaps, his and his wife's personal chef Tafari Campbell had to die drowning in late July 2023, while swimming/paddle boarding near the Obama mansion by the beach of Martha's Vineyard? An accident? Or was he trying to extort the Obama's? Or was he considering to talk to law enforcement? Why did the Obama's keep their once White House chef employed after his presidency?

Or was Joseph Biden mainly bribed so Obama would also be compromised for the rest of his life?