From the article:

"We have a wonderful ability here to choose the right tool for the job. We have components that are written in Java, in C++, in Python, and Ruby and Perl. [Python is] definitely viewed internally here by some of the best computer scientists in the world, people from MITs AI [artificial intelligence] and CS [computer science] labs, as enterprise worthy," he said.

No indication that they're replacing any of the hard core algorithmic stuff that's discussed here:

http://www.paulgraham.com/carl.html