I pay some attention to malaria rates, partly because I like to donate to the Against Malaria Fund[0], and these charts are fascinating to me because I usually just see the UN charts (the first chart in your link[1]). All the other charts on that page show deaths increasing until 2003, and then dropping. They're using IHME data.
Further down, at [2], they discuss why these charts are so different, pointing out that IHME was estimating roughly double the rates as the UN in Nigeria, DRC, and India due to "differences in methodology, data coverage and sourcing".
Cool, that's nice. But what happened in 2003 to turn this all around?
According to the IHME itself, "One of the biggest forces in the decline in malaria deaths was the advent of the Global Fund to Fight AIDS, Tuberculosis and Malaria (GFATM), which provided 40% of development assistance for health targeted toward malaria from 2003 to 2008."[3]
So that's neat.
It's important for us to keep in mind that while aid often messed up terribly (especially in the late 20th Century), a lot of aid has been working really well for decades now. We figured out, for the most part, how to provide aid without it all going to funding corrupt governments, or destroying local agricultural economies.
Here's where I do a quick shill for The Against Malaria Foundation. They're very well-rated by Givewell[4], so if you want to stop malaria, I highly recommend giving them money. :-)
[0] https://www.againstmalaria.com/
[1] https://ourworldindata.org/grapher/global-malaria-deaths-by-...
[2] https://ourworldindata.org/malaria#data-quality-definitions
[3] http://www.healthdata.org/research-article/global-malaria-mo...
[4] https://www.givewell.org/
[5] Also, the mentioned GFATM: https://www.theglobalfund.org/en/