Let me put some rationale here-:
1. This add-on indeed includes a feature to export all user aliases, and I have invested time to produce a video showing how it can be done, but seems you didn't invest time to watch it.
2. This add-on is used by over 1M G Suite admins, who have not yet reported any issues with alias export, but I still investigated the code and functioning based on your comment, and didn't find anything wrong.
3. Ideally you should follow the channels provided to get support (e.g contact me via my website), what if the add-on is working as expected, but you have messed up something?
You decided to come here and straight away claimed that it does not work, I offer this tool for free, and invest my personal time to maintain and support it, I love helping G Suite community till the time help or collaboration is asked nicely, sorry I can't help you here, feel free to stop using it.