I don't think it's true. I doubt Nintendo would end the NES mini so they came make a Mini of a console that sold worse. The NES mini only came out because Nintendo didn't have anything for Holiday 2016. The focus is clearly Switch and I doubt Nintendo would manufacture this product when they could manufacture Switch units (which is exactly what shareholders and customers will say).
Also, every rumor about Nintendo themselves has been wrong. I don't see this happening.
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Known as Smashchu in a former life