The problem is you are using an unsupported platform that neither I nor you know much about, so it is tough for us to work through this together. I have no idea of running RDR 2 or my trainer on Linux, I just know how they are supposed to work and what indicates whether they are working or not. How you can verify these things in your environment, I cannot tell you. On Windows you could use a debugger such as x64dbg or even CE to inspect the loaded modules.