He faces 91 felony count. No offence directly to you but I see this comment a lot. This is plenty of "evidence" that he is about to pay, saying otherwise is basically denial at this point. Sure it could fail, anything can happen. But saying there is no evidence is pretending this is similar to being denounced by the media, or congress, or a civil lawsuit. This is the most concrete, evidency thing that could possibly be happening right now, in this timeline. He's being smited by the country judicial power.

He doesn't have alzheimers, people with that don't make threats to people. He's a mob boss and grifter, that's it.

First I heard about this

This could be seen as a "I have the proof my people, but I'm not allowed to share it, the deep state is keeping it hidden, but I'll release it in two weeks anyway". (Trump time two weeks never happens)

He's doing this because of the Republican Debate which is like two days later. "Governor DeSantis, former president Trump gave a press conference laying out what he claimed was conclusive evidence that the Georgia election was stolen. Have you reviewed that evidence and do accept that the Georgia election was rigged and Trump in fact won in that state?"

A (arguably wide, depending on the poll) majority of Republican voters believe Trump won in 2020 and the election was stolen. Republican candidates have been trying to walk a very fine line of not pissing off the Republican base they need to win the primary by saying Trump is wrong, but also not committing to the stolen election theory which they know is toxic in a general election. So when asked if Biden won they say things like "Biden is the current president." What happens at debates is the moderators tend to focus in on the news of the day. Trump's indictment is news of the day, but all the Republican candidates are very practiced at ignoring the substance of the charges and instead answering with generic "Biden is weaponizing the Justice Department" bullshit nonanswers. What Trump is doing is making the election fraud claims the "news of the day," forcing candidates to specifically deal with the claims of rigging, and any attempt to deflect to complaining about the Justice System will be a dodge so obvious even mouth breathing Republican primary voters will recognize it. In short, Trump is fucking with the other candidates.

And legally, it's not a bad play. He's already fucked on the facts and law, I think he's correct that his best chance of avoiding jail time is winning the presidency. Even with a Georgia conviction, I wouldn't put it past SCOTUS to say a sitting President can't serve jail time for state crimes, or some other wacky shit. All in all, doing this bullshit press conference may actually be a "smart" move from his perspective.