"I assume you mean PT is the communist one". Wrong. The Workers' Party is just the most popular socialist one, aligned with Maduro, Ortega, the Castros and the whole Foro de São Paulo. PCB, PCdoB, PSTU, PCO, UP... those are the communist ones, often very supportive of PT during elections.
"They didn't install communism at all when they were ruling Brazil for 13 years". Who needs an armed revolution when you already sponsor the media (most brazilians still informed themselves politically through the TV in the 2000s); rule over schools and universities to the point where students with different opinions felt and still feel the need to remain silent to this day in fear of being sabotaged by teachers and even beaten up by radical, indoctrinated peers patrolling it all; and have almost every single entertainer/artist/film maker/writer/musician/intellectual/internet celebrity eating out of your hand? The justice system obey$ you, the good selling of commodities have allowed you to create several unsustainable social programs and state-owned enterprises that would fool a few million citizens for a while (you should have invested in infrastructure but you didn't), the approval rating continues to indicate high popularity despite the inumerous corruption scandals unfolding, you were also able to elect a "comrade" as your successor before the greatest recession in Brazil's history started...
Lula da Silva is a cunning man. If he hasn't stopped talking shamelessly about ideologies two decades prior to his victorious campaign, you'd never hear of him, ever. He even made Hitler a compliment in 1979. Now he says that he's sorry for not being radical when he had the chance. Lucky us I guess.
"Calling liberalism 'significant economic interventionism' is just misinterpretation". You have no idea what liberalism is.
"I'm not surprised as brazilian in this thread were able to cheer for Bolsonaro by linking an article saying the complete opposite". Although I might think OP didn't read the article as well, I'm yet to find where Bolsonaro explicitly attributed the decline of murders to himself as if it was a direct result of his actions. Also, I don't think those selfsame specialists would have spared him the blame if the numbers were going up instead.