I heard same thing, but immunity is not a simple as free from prosecution based on several facts( thats why i think many of the ppl we hear about are going to get charged under RICO and immunity from one crime doesn't protect them from still being charged. Heres a few facts about immunity (the irony is the lawyers name is Michael Cohn..lol)   https://www.southflalaw.com/federal-witness-immunity.html