Hey,
Thank you for reaching out!
Discord is currently changing a lot when it comes to the developer side of things so the documentation might be slightly outdated! I will make sure to update this soon. I currently rework every single one of my documentations to be even better 
I will definitely keep updating this plugin! Discord is currently experimenting with a completely reworked Games SDK so when that is available to the public I will do my best to also support that / switch to the new system.
Based on your message I assume that you left a rating for the plugin, so thank you for that 
Make sure to reach out again if you have any further questions!