You submit a run for the "fastest death" category that no longer exists. The "2048 keyboard" category is purely for reaching the 2048 tile without any tool assistance. So, fails do not count as a valid run anymore, but you can still share them in the Discord server. (And don't worry, it's not a dumb question, it can be confusing)
They've wanted to add more mods but it's impossible sadly, as the only mods who are able to give people mod are inactive
"It's not even a speedrun, it's just a joke." Is wild coming from someone who has never seriously tried it. While the times can be pushed further back than without these repeats, it still requires a ridiculous amount of grinding. Yes, getting a sub 40s 2048 is significantly easier with NKRO, but getting a sub 20s 2048 would still require just as much skill as a sub 30 non-NKRO. While theoretically it is possible to use these repeats to get a 2048, it is statistically extremely unlikely, and it has also never occurred in the past. thecabillonaire is right, you can't just spam your way to it.
I only feel like this would be fair to do with 1k and 512. There has been more competition for it lately. But they were also removed with reason.