What's he accused of? Something from 2 years ago? Why would he need to be under house arrest, just start the trial immediately you had forever to prepare. If you can't get the evidence in 2 years then maybe they didn't commit the crime or you should have a slam dunk obstruction of justice case.
The most serious accusation entails the creation of a "parallel intelligence apparatus" which was apparently keeping tabs on the supreme court judges. I don't doubt it.
He's also accused of ordering brazilian police to interfere in the elections in the northeast. I'm not sure if that can be directly attributed to him.
The "questioning of voting machines" and "incitation of protests" are just there to pad the list and insult our intelligence.