I just can't see why Putin would have him killed. It makes no sense to me, he was already in prison, why make him a martyr now, before elections? As an idea elections in Russia are this month.
We also know Tucker interviewed him shortly before Navalny died and we know that Navalny chose to be in Russia. Maybe CIA wanted to not allow people to process the interview and move to martyr Navalny. There are some spicy stuff in the interview like the US blowing Northstream pipeline and Nazis in Ukraine so who knows.
Every media and politician is 100% sure Putin killed him without even considering any alternative.
My take is that the CIA killed Navalny in order to start unrest before elections or to make sure normies keep funding Ukraine.
But if they did it would be very bad for Putin so he would keep quiet about it rather then point the finger at the CIA.
The CIA killing its own agents would be more damaging than this to Putin. The problem for Putin is that the corrupt Western media would likely cover it up, so it would only reach Russians.
Is it more damaging to Putin that the CIA can kill someone in a Russian prison, or to the CIA's prospects in Russia if they knew that they'll kill their own men for a quick PR bump?
If I were Putin, I'd reveal it - assuming the CIA story is true.
In the Tucker interview he said something to the extent of Russian propaganda is no match for American propaganda. Him saying CIA did it would be turned in to a meme in 2 mins. Him not saying anything, regardless if the CIA was involved or not may prove to be better PR in the long run.