Context on the Shen nerf on the PBE. Any Rioter?

It would be really helpful if a Rioter could explain the Shen nerf on the PBE. Being a player who loves to play Top Lane Shen, I feel that this nerf will make him completely unplayable. Also, the numbers don't make sense. The heal Shen currently gets is not 6/10/14/18/22 according to the wikia.
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