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I was having the same issue. Had a few times where I was set back a back. When I prestiged yesterdayand went to level 14, but at some point the server browser failed to load so I restarted the game, I was even set back to level 49 from before prestiging.
But the use_localStats 1 seems to work.
The April fools thing was great; I would love to see it as a mod for BO1 and WaW 
It's an April fools' joke
They'll probably release a patch again tomorrow that reverts it. I'm wondering if the mirrored mode gets released as a mod.
Same for me, but for WaW. Launching Plutonium itself also takes a lot longer. Server issues, perhaps?