that means that each element is calculated by the xor of the column and the rowm (starting from zero)
in other words, the very first element (column 0, row 0 ) = xor of 0 and 0, which is 0

xor is a logical gate, and can be used as an operation between numbers
in python and other languages, xor operator is represented as ^, so xor of, for example, 1 and 6 is 1 ^ 6
the element in column 6 and row 4 is 6 ^ 4 = 2
the element in column 8 and row 2 is 8 ^ 2 = 10

the unit used is in seconds, so a worshipper in row 2 and column 8 can give 10 seconds of life to the Elder (disconsidering the loss)
you can search on google to find xor calculators and discover more about how the calculus is done

I did the same thing! :)

you're right!