I think they probably are, but they could also be right (maybe without realizing the nuances).
It may be true that slowing down loss of nucleotide synthesis, while not fixing the root cause, may still slow down the aging process. Just like giving Parkinson's patients L-DOPA doesn't resolve the root cause of the disease; it's treating the effect and not the cause. But there isn't really anything better out there (AFAIK), and it slows down the brain degeneration process by replenishing one of the important things that gets destroyed in the degeneration, just as fixing nucleotide production may slow down cell degeneration. It's a very imperfect solution, but it still provides some relief for many people. We've got to work with what we've got.
It may be true that slowing down loss of nucleotide synthesis, while not fixing the root cause, may still slow down the aging process. Just like giving Parkinson's patients L-DOPA doesn't resolve the root cause of the disease; it's treating the effect and not the cause. But there isn't really anything better out there (AFAIK), and it slows down the brain degeneration process by replenishing one of the important things that gets destroyed in the degeneration, just as fixing nucleotide production may slow down cell degeneration. It's a very imperfect solution, but it still provides some relief for many people. We've got to work with what we've got.