Because the police wouldn't want to alert the people being investigated they were recorded committing crimes.
> they obviously implicated Lula and his people
There is no evidence in any recording made available. Quite the contrary - there is ample evidence of misconduct by the district's police that answers to the secretary of public safety, who was visiting Bolsonaro at the time, by the military, and by the members of the institutional security cabinet, mostly carryovers from the Bolsonaro government.
Days prior to the events both ABIN (intelligence services) and PF (federal police) warned Flavio Dino (minister of law & order) of the build-up and he did nothing (which is a crime). Everyone in the country knew this thing was going to happen.
Because the police wouldn't want to alert the people being investigated they were recorded committing crimes.
> they obviously implicated Lula and his people
There is no evidence in any recording made available. Quite the contrary - there is ample evidence of misconduct by the district's police that answers to the secretary of public safety, who was visiting Bolsonaro at the time, by the military, and by the members of the institutional security cabinet, mostly carryovers from the Bolsonaro government.