Argument of conditional MODE function

Question

What is the purpose of adding {0,0} to the MATCH(...) function to be value_if_true part of a conditional MODE Excel function?

MODE(IF(COUNTIF(C$1:C1)=0,MATCH(A$1:A$43000,A$1:A$43000,0)+{0,0}))

This combination is now working well for my purpose, but I don't know what is the necessity of {0,0}

The difference is that with {0,0}, MODE will return all existent numbers firstly duplicated and then remnant in a range(here a column), but without it, MODE just returns duplicated(if any) or #N/A(if not).