It looks as though some have discovered a way to prevent AutoIt from being decompiled. (Although you are not allowed to talk about that on the AutoIt forum.)
Not exactly true as shown in a recent post
Obfuscation (as practiced by Obfuscator and as demonstrated in the snippets posted above by the OP) has never and will never be a problem. All that is changed is the script itself. Altering an already compiled exe to prevent decompilation is also not a problem - several threads have been allowed showing how this might be done.
However, we are certainly not going to to give official blessing to anything which might act in such a manner - it is for the individual to test them and decide whether they are suitable. And as has been already been pointed out, mentioning decompilation is best avoided here - a good reason for the results of any such tests to remain private.
What is a problem is altering the AutoIt3.exe or Aut2Exe.exe executables - that is against the EULA.