While it doesn't make things predictable unless you can predict central banker's whims, this is no conspiracy theory. It's a fairly accurate description of mainstream Keynesian macroeconomics. I might tone it down by saying bad recession happens when central banks accidentally overdo their inflation control but sometimes it doesn't seem so accidental, and more a question of incompetence.

Like when central bankers refused to use negative interest rates even though the natural rate was clearly plunging into the negative. In 2009 their own Taylor rule models put the correct rate at negative 4% (https://www.brookings.edu/blog/ben-bernanke/2015/04/28/the-t...). Central banks kept interest rates very high at zero.