No public statements by officials of any government or organization can be believed. They may or may not be telling the truth. The story will be spun in accordance to whims/wishes of whoever is spinning it. It could be a coup attempt by Wagner or maybe the longtime Putin loyalist is doing this for Putin to see who in the military end up demonstrating a lack of loyalty to Putin. There are lots of possibilities but whatever the truth is it is a fascinating story.
Churchill’s quote seems apt. Russia is a riddle, wrapped in a mystery inside an enigma.