What about Bolsonaro and his officers? The court was biased, but the weight of evidence suggests a similar sentence would be given by a better court. Perhaps major details were made up by self-serving witnesses.

According to witness testimony, secret meetings with military commanders discussed a state of emergency justified by a rigged vote and abusive courts. A decree was even drafted and at least one version is available online (https://www.cnnbrasil.com.br/politica/confira-integra-da-minuta-golpista-apresentada-por-bolsonaro-a-freire-gomes/, https://www.conjur.com.br/dl/de/decreto-golpe.pdf)
The Navy's commander, admiral Garnier a sinister fellow when he's got his sunglasses, just look at him agreed with the plan but the Army and Air Force wanted nothing of it. This is also a self-serving story as these supposedly democratic anti-coup generals didn't lift a finger when thousands of demonstrators camped in front of their barracks to demand a coup.
Allegedly some special forces hardliners had a plot to murder Lula and Alexandre de Moraes and this operation was actually launched on December 15th but called off.

When I followed the news on late 2022, I knew there wouldn't be a coup because Bolsonaro is a pussy and the opposition was hysterical. But Bolsonaro's supporters openly calling for a coup for months on end is indeed strong evidence that he had something of the sort on his mind.

And how would this coup look like? The state of emergency draft decree is a nonstarter as it only allows action against the Superior Electoral Court. Nothing to deprive enemies in Congress, the media and state governments from reacting with their levers of power. And the Biden administration had already made clear it would oppose such a move. It'd be as much of a fiasco as the 2024 South Korean self-coup attempt, but with a chance of chaos and bloodshed if bolsonarist hardliners in the military chose to react on their own.