Seeing as how PS4 and XBO have been pretty close to each other for the most part with PS4 being slightly ahead every month I don't see what's so different about May that would make XBO DRASTICALLY drop to the point where it's not even at 100k.
In April NPD (month before may)
It ended up like this (neogaf):
Nintendo Switch: 280k
Xbox one selling about half of the PS4 is.... close? PS4 just slightly ahead?
It hasnt been close all year.
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249
Bumb in 2021: http://gamrconnect.vgchartz.com/post.php?id=9047071