But then you are still stuck with the sentence he said right before that quote:
Again, this would just slow the process down even more than it was before.
Tribunal wasn't removed because it was too inaccurate (which it really wasn't), but rather because it was absurdly slow.
The whole idea of the current system is its name: "Instant Feedback". Some cases took months to actually process through the old Tribunal. And that massive backlog resulted in multiple problems:
First and most obvious: It can't reliably weed out players when it's this slow. It also cannot really deter players properly either. It fosters the good old "Let future me deal with this problem"-attitude, where people can be assholes now because chances are it will take a long time before they even receive their first punishment.
Secondly: It ultimately made Tribunal more lenient, because no matter how old the case itself is, voters are presented recent games when they finally get to vote on it (which makes sense for its own reasons). So somebody that may be a gigantic douchebag in half of his games but plays extremely rarely can get away with it by having a short streak of neutral games at the right time.
Last but not least: Even though recent games were used, there was still a massive disconnect between these peoples' actions and their punishment. They might have figured that their behaviour was acceptable to some degree, because they went months without being punished... and when they finally do get punished, it might still be for a game they no longer even really remember (since "recent" is still a fairly large timeframe). Short version: The slow punishment might make people form a habit and fails to point at mistakes when they're still fresh.
So even if you ignore that Tribunal took way too long to punish people - if it ended up punishing them at all - it was still extremely bad in terms of reforming.
Your suggestions mostly revolve around improving the old Tribunal's accuracy (which wasn't that bad; its specificity for example was very high), while making the actual problem it was having even worse.