What pray tell, deals were those? Didn't PS4 have a cut to $250 for much of February in fact while Xbox did not? https://www.gamespot.com/articles/ps4-price-drop-to-250-goes-into-effect-for-a-limit/1100-6447775/
Actually I had forgotten about that cut, it may explain part of PS4's good showing, although I dont think it needs much explaining since it was similar to February 2016 results. Since then they also have launched Pro and PSVR, two huge hardware launches.
Sony is definitely in a position of strength until Scorpio comes out due to Pro. However Switch could obscure some of that momentum by winning some or even all of the months until Scorpio.
It looks to have been just less than two weeks