Not sure this chart is accurate anyway. MS are selling the X1S for 239,- including F4, RDR2 and a 30 Euro Live card where I live (Germany).
The Xbox1S could have been bought for an average 249.- for the entire year now (those are end prices for bundles with 3-4 games and a Live card). Sometimes the cheapest bundle was 199.-. Meanwhile, Sony increased the list price to 329.- from 299.- for the plain box (end of old ram deal?). t seems MS has to sell its console at a significant loss to actually sell it outside the States (though the average bundle price has also increased in the past weeks, but is still way, way, way lower than for the PS4)