From the link:
The King's College London study of 10 UK hospital sites plus one in Italy found at least one in eight patients who had received hospital treatment for coronavirus had caught it on-site.
Researchers said that was a relatively low rate and showed there was effective infection control in place.
I have no knowledge of intra-hospital infection rates but is that really a 'relatively low rate'?
No idea, but those tested 5 to 14 days brings it to 23%.
It was around the time of the peak though, so very different times.