Quote from the article (emphasis in original): "Our target for a suitable exploit delivery vehicle is open-source applications where the collection and distribution of high-frequency mouse data is not inherently suspicious. Therefore, creative software, video games, and other high performance, low latency software are an ideal targets for injecting our exploit."

My comments: yes, because exploits being injected into open-source software are famous for not being discovered. Obviously it can happen (look at xz, or the recent Shai-Hulud worm on NPM), and it's entirely possible that it has happened to other places that weren't discovered. But with xz the exploit was caught quickly enough that it didn't reach production, and with Shai-Hulud it was contained within days despite having the potential to spread to every package. I doubt that anyone trying to stick this kind of thing into open-source software would get away with it. Closed-source software, OTOH, would be a far more likely distribution vector. Just persuade some overworked dev that he should use this handy library that tracks high-precision mouse movement in his game, and you've injected your exploit.