I already have an existing world that was generated with the "offending" line.
Since the world is already generated, I just removed the line and was able to start the server, so I don't need to actually generate anything.
As such, an existing line shouldn't cause a crash on startup. Or at least give a proper error on what to fix.
This is definitely broke from multiple browsers.
Old working Linux link for those in need:
https://minecraft.azureedge.net/bin-linux/bedrock-server-1.16.0.2.zip