Two things come to mind when I see this.
First is:
Why are you running Wemod in a multiplayer game that registers it as program you can get a ban for?
Second is:
Fallout 76 is server sided save, so running Wemod is pointless anyhow.
Wemod is running in the background. I’m not using it to play the game. Thanks for your answer.
The reason is the game detects anti-cheat software in the background. If you just exit wemod from the taskbar or taskmanager the message will go away.
Kazadora was more specific than what I mentioned in my first point.
Even if the game is running in the background, 76’s anti cheat still sees it.
Shut Wemod down completely (task manager or right click on the task bar) and it won’t see it and crash out for running a cheat.