This was tested in Singapore 10 years ago and successfully reduced the spread of Dengue fever by 77% and has not negatively impacted the ecosystem.

This isn't a project to eliminate all mosquitos. There are over 3600 species of mosquito - this project is only targeting one: Aedes aegypti, which spreads many diseases, and is in fact an invasive species. Anywhere you see an Aedes aegypti outside of North Africa, it was humans who brought it there in the first place. This project is just trying to undo that.