[liquid]

RCE has two meanings , Remote Command Execution(executing commands to the server) which is what I just mentioned above and Remote Code Execution (Which is by using file protocols that may lead to reading an arbitary file , etc ...) which I posted a tutorial about then deleted it , I'm capable of re-sending it to you if you want .

Not wanting to piss on the time/effort you took to write this up...
but you may want to hold off re-sending anything before you can argue the difference between the two....
(I want you to re-read the quote above)

https://www.owasp.org/index.php/Command_Injection
https://www.owasp.org/index.php/Code_Injection

Also fix the terminology in your tutorial

[Concept] RCE [Remote Command Execution]

How Does Remote Code Execution affect a script :