That's just the The Forest server installation guide that they modified the name for. Probably hoping to capatalise on the SEO benefit for the incoming search engine surge.
-Xmx2048M -Xms256M is just allocating min/max RAM to Java. The actual server might still use more. You need to set the maximum RAM in the service settings as well:
I noticed the "Current Activity & Stats" tab wasn't working. It was due to the Query protocol "Half-Life 2 new" being used. Changing it to "Half-Life 2 new (UTF-8)" fixed that. Thanks @Dennisfor the solution.