I don’t think you read the 10/6 results very closely. There was far less water flow than that, and there was only one unit tested rather than all 50.
What else have you gotten wrong, hmmmm?
From the 10/6 data we have 0.18 l/s.
0.18 l/s * 60 s/min = 10.8 l/min.
10.8 l/min * 60 min/hr = 648 l/hr.
Sounds like someone on Rossi's team goofed!