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Are you sure about this? I can't see how the lateral movement of the jockey wheel is controlled by the chain length? It just looks like the distance from the cog to jockey wheel is controlled by the chain length, but the lateral movement is still controlled only by cable.
It sounds like that is actually the whole point of x-horizon, that vertical forces like chain slap wont move the parallelogram and thereby the jockey wheel laterally to create "ghost shifting".
I'm no engineer, but that's what I get from the below links.
https://www.youtube.com/watch?v=bQEMySJX0DA
https://www.sram.com/sram/mountain/technologies/x_horizon
topkek
TvH
The X-horizon ones won't. They have a horizontal parallelogram, and the movement of the jockey wheel laterally is controlled by the chain shortening as you shift up the cassette. A front shift will fuck it up.