But per your link "Clean-room design (also known as the Chinese wall technique) is the method of copying a design by reverse engineering and then recreating it

But per your link "Clean-room design (also known as the Chinese wall technique) is the method of copying a design by reverse engineering and then recreating it without infringing any of the copyrights associated with the original design." They did reverse engineer the code instead of infringing copyright. The problem is that it violated a license prohibition on reverse engineering. I'm not going to claim that the judges interpreted the law incorrectly, but I think that this legal result is overall bad for society. It means that a company can stifle competition even if potential competitors avoid violating copyright or patents.