First of all we need to even establish what it actually means for something to be called dead. For anything to be produced dead, then its must have existed and stop existing at a pint in time. Or are you saying that bitcoin is abrogated? None of this seems to be true about bitcoin. Hence the claim must definitely be regarded as false. Bitcoin is rather interesting to another level of adoption and its volatility is reducing as compared to when it was much younger. I want to also remind you that bitcoin is 17 years old already and its getting more popular and adoption. so if you dont want to be around bitcoin its not a problem but there is nothing your FUD would cause to the level bitcoin is and i honestly wonder what who doesnt believe in bitcoin is actually looking for in a bitcoin forum. Do you plan to come and create controversies or you just catch cruise and having your drink?
Dead means dead, keep it simple.
Bitcoin is dead if its blockchain is dead, no miner, no mining, no node, no new block found, no new transactions to be confirmed.
Bitcoin is dead if its market is dead: no buyers, no sellers, no trading volume.
Bitcoin is dead if noone can use it to spend for something, buy something with bitcoin.
Dead is always simple, it's dead but fortunately Bitcoin is not dead.
If you want to know it more, look at dead altcoins and see how deaths are with altcoins.