He get asylum because Mexico authorities see his charges as political persecution. There is a trend in Latin America of bogus corruption’s trials against left wing politicians, as Lula, Kirchner and Morales cases show.

Always remember that the tribunals are not that just and independent at all, and condemnations can be made up.

Authentication bypass should give you interactive access. “I’m in” like. Remote code execution only allows you to run a command, without permanent access. You can use some RCE vulnerabilities to bypass authentication, but not all.