[cc_]

Not an expert, but I think an important part of this is only releasing male mosquitoes, and separating them at scale is generally considered to be difficult (there have been other successful uses of SIT but always with different species).

From their FAQ it sounds like they have made progress on this front:

> What has Debug accomplished so far?

> We've developed methods for automated mosquito-rearing, and we know that we can separate males from females with high precision, and we’re continuing development of these technologies at larger scale in our lab.