"Could" does a lot of work in these kinds of claims.

We need to build it as fast as possible because it could cure all disease. Ignore whether that's possible, how it might happen, whether all we're missing to do it is more intelligence, etc.

The only way I see us curing all disease is to throw out all the names we've given to collections of symptoms. What disease? I don't see no disease, you just have a sore throat, runny nose, and mild fever.