I don't know the quilt you are referencing. However, the one posted looks like a combination of clamshell techniques and New York Beauty techniques. I have found lots of tutorials on how to pp clamshells by hand, but not many places to find the actual clamshell pattern online for free. I have seen it on Inklingo as a pattern to buy and print on fabric or paper and at PaperPieces to buy the actual papers though.
It is on my bucket list along with apple core.