More relevant than Bolsonaro conviction, it's that the generals that were involved in the coup plot, were also convicted.
This is the first time that a General get arrested. Brazil had several coups in his history, they never got arrested.
The last general that got arrested in Brazil, got arrested for... trying to prevent a coup. Henrique Teixeira Lott.
https://en.wikipedia.org/wiki/Henrique_Teixeira_Lott