Thank you, Buddy #5, for your helpful post. It enabled me to make sense of the bottom line, to correct an error, and to give me an admiration for the brilliance of the construction of the puzzle.
I think many solvers are likely to be baffled as I was. What a pity that people may be put off by the obscurity of the preamble. But it does suggest that numbers even higher than 52 may be needed.