Its safe when made in VERY VERY VERY specific conditions. Specifically temperature. If its off by even a couple degrees it will create another compound that is deadly. That is why it is unsafe, because its is too easy to fuck up. Its why when researchers tested, it was fine. Cause they were following the instructions to a t, and could reliably replicate the conditions.
This video covers it. The first half is about the pesticide, the rest is about why farmers can’t plant their own seeds.
Its not dose, its the conditions for making it. The temperature when producing it needs to be super accurate. Even being off by a couple degress will fuck the whole thing up.
https://youtu.be/CxVXvFOPIyQ