Prigozhin seems to claim to be launching some sort of coup or civil war in Russia, but at the same time saying it is not a coup.

He says that there was no rational reason for Putin to attack Ukraine.

Any or all of what he claims about events could be bogus. He may be trying to seize power from Putin. Or it may be a stunt, planned with Putin. I can't come up with a rational explanation of it. But it seems unlikely to me that there will be room for both of them in Russia after this.