I’ve gotten used to Vox and others trying to patch a lack of facts with a good narrative.
This video doesn’t really say something is definitely happening, it just paints a picture of what some people think might be happening and leaves out other parts of the discussion. It leaves out discussion of things like increasing mosquito population, population density, etc. It assumes that the species that are left are going to be the ones that are the best vectors for disease.
Basically, the video is written to be more eye catching than informative.