The person he's replying to has a simplistic view, his view is "injecting parasites into people without their permision bad" a very fine view to have. However we're discussing a situation where these parasites are infact symbiotes, were alternatives are more deaths.
We're also not doing it from a position of "mosquitos couldn't be used to spread human selectable things to kill humans before and now people suddenly can spread genetically modified killer parasites".
The one thing this research does is add the ability to spread immunity to malaria through mosquito population it doesn't change anything else about what could be spread by mosquitos before. People have been using animals to spread disease as a weapon of war since medieval times this is not a new vector that will suddenly be exploited.
This can only be a good thing unless you view the vaccines as a danger worse than the disease (which with such a widespread and deadly disease would be rather unlikely in any objective sense) or to be simplistic you believe in the inalienable right to be a vector to spread diseases to those around you.
