It's accurate but misleading. Let me fix that.

I think they run the entire frontage of 50+51 now, and those addresses are evidently a single building according to 
https://www.oxfordhistory.org.uk/stgiles/tour/west/50.html
https://www.oxfordhistory.org.uk/stgiles/tour/west/51.html

I think it makes sense to merge the two building outlines into one, and move the cafe and any other businesses to enclosed POI nodes. I'll do that.

51 used to be a newsagents till recently, and I guess I updated it and didn't merge. Hard on a small screen!

https://www.openstreetmap.org/way/113720959/history