I often think that I would do the same thing if I or someone I loved had a chronic disease, either go all in in a specific project before I die, or go all in on a moonshot to accelerate a cure.
A subtle change that I think could have a lot of potential impact is changing it to "I'm going to try to cure".. instead of "I'm going to cure".
It will still be true, it will still be an act of love, but it removes the aspect of being a way to avoid the pain of a loss. In fact, if you face the likelihood of loss, then you will be able to actually optimize for increasing likelihood of a cure instead of risking optimizing for maximal coping mechanism.
I agree the way he writes about it is uncomfortable. At the same time I also think some people motivate themselves with a version of "Do or do not, there is no try." He desperately wants to do something, but a lot is simply out of his hands. Still, that energy has to go somewhere.