He’s talking about Andres Freund, who uncovered the OpenSSL backdoor that was slipped into liblzma from the xz malicious maintainer. Dude saw a valgrind error and a function with a fixed runtime was taking too long and using too much CPU and reversed out and saved a major ssh backdoor from going upstream as Fedora was going to release it just days later.
I mean, does writing in Python rather than C free up your mind? It’s just another abstraction tradeoff.