I'm not sure that nourishing a craving for immortality, when we know it probably won't happen, is the best way to improve the quality of one's life.
From a pragmatist's perspective, I can see your point that it could be viewed as delusional thinking. But, then again, this reminds me of my dog who this past Christmas was diagnosed with terminal cancer. His tummy is bloated and it's a fast-growing tumor. Even if they operate to remove the tumor his prognosis is grim He was also suffering from a bacterial infection that caused hematomas which started to burst and bleed. From that perspective, I thought of putting him down, but there was something in his eyes, his alertness despite he was acting depressed, that changed my mind. So I choose hospice for the animal, he takes a Chinese tea that prevents the tumor from bursting and bleeding and some pain killers when needed. Surprisingly he's gotten better psychologically, he still goes on walks, plays with the other dogs and I do feed him steak every day since these are his last days. So while there is no solution for Leo he has benefited from my compassion and humanities technology where otherwise his last days would be miserable.
My point is hoping form immortality is not what I'm doing, I am motivated to participate in the development of technologies that could realize in some form of immortality, and likely not in my lifetime, but it improves my outlook on life that one-day humanity won't suffer from death or at least death becomes a choice rather than an inevitable outcome. Coping with death is something humanity has been doing for tens of thousands of years, and that I prefer to deal with it as an engineering problem that one day may be implementable, to me, is better than simply accepting or complying with it. Motivating the use of neural networks to solve real medical problems is much much more acceptable than it was ten years ago. To promote such technology, even as a hobbyist, creates the ambiance and social awareness to continue the effort. While I know the chances of winning the lotto is remote, if I don't buy a ticket my chances become impossible. So I've got nothing to lose to keep the idea alive and well, even if it's in this obscure forum of Artificial intelligence. As they say, the flap of a butter fly's wings can contribute to the formation of a hurricane.