I have never really understood people's preemptive panic about being Bitcoin being dead every single time there is a huge dump correction. Sure I can understand the fear and uncertainty that people feel, especially those who are new to Bitcoin, but I still would never assume something just because someone else said it or because I have a "gut feeling".
Without an objective proof, there is no point in saying or believing that Bitcoin is dead. That is to say: there is absolutely nothing that this rumor is based on. (If you can even call it a rumor in the first place...)
Because they are newbies, don't understand how Bitcoin blockchain works and when the network, mempools have problems, dead FUD will be used to make newbies panic sell.
It does not need to have any solid logic behind of "Bitcoin is dead" FUD but newbies are a most vulnerable participants in this market to be affected by FUDs, not only by "Bitcoin is dead" FUD. It is a lowest level of FUD but it usually comes from big names with great influence.
A higher level is at governmental, regulatory level and it will affect not only newbies but people who are in this market for a while and even years. This blockchain industry and cryptocurrency market are very new and super sensitive with new regulatory enforcement.