It doesn't mean that when a certain coin is not being talked about, it's dead already but it's more like not relevant to the current trend or narrative that we have on the market. It's always about the narrative when it comes to being talked about.
You would consider it dead if there's no volume and no one is trading it anymore. It's not the case with LTC.
I wouldn't consider Litecoin, dead too, because it still has volume and people are still trading it, the issue is that it's just not trending right now, we have a lot of projects that are in the limelight in this road to bull run. Remember that sometime last year the same question was being asked about Solana, some where even speculating whether it's dead, but fast forward to now, it's the most talked about altcoin in the crypto space, so I believe that Litecoin dev. team can become innovative and restore it's lost glory. Litecoin, remains a top altcoin, as far as I'm concerned.