Is there somewhere I can get the source code for this to install on my own Pi 0? I tried a bunch of the links but couldn't find it.

I really dislike this trend of making the link text have little to nothing to do with where the link goes.

Edit: for research, I don't plan on using this against someone.

Over on his website [0], Samy provides a link to the source:

https://github.com/samyk/poisontap

[0]: https://samy.pl/poisontap/