Having identified the 16 and 49 pairs in column 7, you had fully solved the puzzle with only basic sudoku remaining: With cell r5c8 being a 49, the next digits on the right in columns 8 and 9 can only be the 7 and 8 that point from the left in row 6. Then there is also a 1 pointing in row 6 from the left, for which there is no room left in block 6 other than r4c7. So your 16 remote pair is disambiguated, 1 in row 4 and 6 in row 3, and 6 in r1c6, etc.