The article is a bit inconsistent on its claims. But in the paper the authors seem to say that intact DNA sequences could exist:
"... to this date, the possible preservation of original proteins and DNA in deep time has not been convincingly eliminated with data."
"Our data support the hypothesis that calcified cartilage is preserved at the molecular level in this Mesozoic material, and suggest that remnants of once-living chondrocytes, including their DNA, may preserve for millions of years."
"... to this date, the possible preservation of original proteins and DNA in deep time has not been convincingly eliminated with data."
"Our data support the hypothesis that calcified cartilage is preserved at the molecular level in this Mesozoic material, and suggest that remnants of once-living chondrocytes, including their DNA, may preserve for millions of years."
https://academic.oup.com/nsr/article/doi/10.1093/nsr/nwz206/