HW sales outside of the US and UK have been terrible for XB1 (a lot worse than X360 even), .
See, that's the part we dont really have evidence for. People confuse XBO is getting clobbered by PS4 in continental EU with XBO is selling worse gen over gen relatively than 360 in continental EU. There's not really hard evidence to my knowledge of the latter.
I doubt anybody like Chris can show me "OK X360 did this number in Portugal in it's 1st year and XBO did 50% less" or whatever. Although even then it wouldn't prove anything by itself, and you'd have to account for XBO getting a late start etc.
XBO ratio being up to 55% USA I could reasonably see, but I'd be surprised if it's higher. My working estimate will remain ~50%.
And remember again there's lots of slop in the ship numbers, they usually seem slightly higher than recorded sales for whatever reason (demo units, giveaways and stuff maybe). So comparing USA hard NPD sales to worldwide ship, the extra slop will be in the ship numbers part or the rest of world part not USA, somewhat inflating them vs NPD recorded sales for one country only.\
Also we do have Xbox One ship totals for the two quarters MS gave them. Which was 5.1 million. And NPD sales for those quarters was 2.527 million. So the 50% ratio held there perfectly, despite XBO launching late in all but the large EU markets.
Now too be fair I wouldn't put too much stock in any quarter or two as the USA:World ratio can vary a lot for a given quarter especially a slow one, it only holds over the long term. So had the ratio been 70% I still wouldn't have seen it as evidence of much, but it is a data point.
But, as I keep pointing out it's unlikely MS is ever going to publicize many numbers this gen. While the 200 sales watchers here and on Neogaf might be shocked if MS announced tomorrow they've shipped 15 million, as I believe they are near, all that would happen in the wider world is IGN and other sites would put up some stories and videos about how PS4 is WAY ahead of Xbox One based on Sony's reporting so far (the 22.3m last time they mentioned, etc). And MS could live without that publicity.