Will there be a plus-sized Iphone X? Almost certainly. Will anything else in this rumour turn out to be true? Probably not.
I can’t see Apple cancelling the regular Iphone line until their production costs on the X line fall to the point where they can lower the cost of the X to $650-700. They love them their margins at apple, but they also know they need to provide phones at a range of price points as well, or they won’t get the overall numbers they want. So barring a miracle in production cost reductions, this fall we’ll be getting 4 models of phone (X and X+, 9 and 9+, with base prices at every hundred dollar increment $700 to $1000). And also a new SE model, probably this spring or summer.