I agree with Trix, there’s just too much here. Mecha didn’t trip me up, but it is a good note if this is going to people who aren’t deep into that branch of scifi.

Depending on what your actual story/main antagonists are you could essentially cut everything between the word cure and “he discovers a rogue AI” ? something like this: “A dying and disgraced mecha pilot searches for a cure to his ailing health, but instead discovers a rogue AI is responsible for his condition, and he must stop it before its plans to ?purify? the world come to fruition.”