Given that the success of Rybka can't be entirely attributed to copying an open source engine this does not seem like a smart decision on the part of the author. The similarities are nothing that couldn't have been re-implemented, even if fruit's architecture was superior. I don't think that Rbyka is just a tuned version of fruit in any case. It is obvious that a lot of work went into the design and development. The report is quite damning, however.

The interview itself is tremendously unconvincing IMHO. https://www.youtube.com/watch?v=cQshTNJ4pSM