I find these results extremely promising. If I understand the numbers correctly, about 450,000 children die of malaria alone every year. That means a 13% reduction in deaths would save over 50,000 children per year. This is a lower bound estimate as well, as there are other sources of child mortality and the 13% figure is for all deaths.

I think some of the other commenters were expecting higher numbers. It has been very difficult to produce a malaria vaccine in the past, and we already knew this particular one was not very effective. If you had this as a prior, you should be able to see this as the breakthrough it ultimately is.