They are dead, there are just people thinking it will still get there in its ATH once again, Binance was probably having a huge stash of these LUNA to dump on investors as well, we may never know the intention that they still support them but it's my wild guess.
They are still trading, the developers are still active. Indeed Luna developers messed up big time but declaring they are dead isn't right IMHO. They are barely keeping to survive but I think there is always a possibility even in a little chance that Luna is just buying time for us to forget about their fiasco, then doing massive advertising and promotions to hype their project when the hot news of their failure died down and majority of us forget or doesn't care anymore.