I hope this will encourage a few anons.
What does he mean by "that works". Kinda suggests the previous ones didn't and/or that it didn't work "well enough" as a genocidal bioweapon.
This reminded me of this story from a number of years ago.
https://www.bbc.com/news/world-asia-
36185549
Reckitt Benckiser sold deadly sterilisers in South Korea
Story is old, but relevant.