I dont think they mean that th ebitcoin is raelly dead but he is going to be dead because lots of people are not investing into the bitcoin because the halving is caring them off you kjnow.
I also do not think that they are really meaning this because they are just angry on the bitcoin itself because they most likely lost money because of it what is their own problem of course.
Yeah that is the main reason why they are keep on saying bad things and negative things about bitcoin for they totally hate bitcoins.
It's either it is making their business near to close and to be dead just like what they are saying to bitcoin so in reality they are the ones who are close to be dead.
Not totally bitcoin.
It's possible also that these people who said bitcoin is dead are those who don't believe it bitcoins potential to make them invest their money or it's their strategy to discourage other people to invest in bitcoin especially the newbies so that it will be more for them to earn.