As a rule, if the CIA tells you something, it's a lie.
First of all, the CIA owns the Washington Post. They gave Bezos a massive contract worth hundreds of millions of dollars and Bezos immediately turns around and spent half of it to buy the WP. The WP has since received dozens of leaks from intelligence sources.
What happened on November 7th 2017? Regime change in Saudi Arabia. Who's happy? Trump administration. Who's not happy? Globaly, deep state. Locally, the democrats involved with the deep state. Who's the deep state's tool? The CIA. Why is the deep state upset? The regime change ousted the corrupt government they had control over.
Apparently Turkey has proof of what actually happened to the reporter, but they refuse to share it. Instead they are allowing the world to speculate. If they have proof he's dun it, why not come out with it? Because it's painting a bad picture of their rival country and it makes their deep state masters happy.