A chink has described a small tear or hole in something for hundreds of years. A chink in the armor was a weak spot that would be penetrated by a sword.
The holes between logs in a log house were chinks, and filling those holes with mud was chinking.
I saw the headline and didn't think anything of it. I doubt if the writer did either. But then I don't get up each morning and hunt for a reason to be offended. Time to lighten up.