You are right...I will not advise that..
But i installed a foldable screen behind my listening position but it was MY ROOM,
with 100 resonators and heavily transformed... In a normal room i dont think that it will be perfect at all..
And my foldable screen was modified by acoustic devices too...
General rule : no foldable screen behind ...But every rule may had exception..😊
It is why small room acoustic is so complex... General recipe are only that : general recipe...
I would not recommend a screen behind you. I tried a folding screen like bleske’s behind me and it messed up the sound. My listening area opens into the rest of the space and sounds much better that way.