You are speculating as that is not what the article said. Even if you weren’t there is no disputing that this stuff could be easily weaponized into something that does to us what we do to fleas when we flea bomb the house.
I’m not speculating, I’m bothering to understand basic behavior and biology. He touched his eyes, the article was not written by an all seeing all reporting god, they skipped a step. We touch our eyes, we touch our eyes constantly, you’ve probably touched your eyes at least once while reading this or typing a response. It’s what we do. The skin CANNOT absorb opioids, our eyes with their basically exposed blood vessels can. He touched his eyes.
Lots of stuff can be easily weaponized. Welcome to the mid-20th century.