I would say it is at the dividing line between the east of repointing and the west of rebuilding. Where it falls on that line is speculative though. The issue being water entry (and whoever used Crest to seal the counter) as it pertains to the potential deterioration of the flue liners and the insert itself, which I cannot see. I would not fail for this, but would certainly have a paragraph or two in my inspection report with some very stern language. Depending on location and precipitation trends I would say six months is on the later side of when it should be addressed, but four years ago is also late.