Facebook Can Absolutely Control Its Algorithm

No one has claimed otherwise.

The claim is that it's either (1) inappropriate (because it is a social platform) or (2) extremely difficult ("For example, the Russian campaign purchased ads that both supported and criticized the Black Lives Matter movement, according to the Washington Post. Martinez, the former product manager, describes the problem as 'playing whack-a-mole.'")

That Facebook has control over its own algorithms is not news in any way. The title misrepresents the points being discussed.