So i found a solution to my issue.
factorio-current.log is useless for getting chat output and i wasted too many hours trying to somehow get the standard output for the server.
However if you launch the server with the "--console-log <path>" argument you get a separate file which contains any ...

I'm trying to read what factorio writes to console so i can relay join/leave messages and the ingame chat to channel on discord via a bot made in c#.
The server is running on windows and I have had no luck redirecting the stdout of the server (I have code that works fine with other console programs ...