Yeesh, please tell me you didn't write all of that yourself. Which uC is it targeting, and which language?

From the photo in the link it looks like he's using an esp32-s3.

I suspect that 110k number might include the ESP-IDF libraries as well as his own code.

I've written a fairly feature-complete handheld device based on the esp32-s2 and the codebase is about 9k sloc of the C I've written, but that number explodes to almost 40k sloc if I include the esp-idf's imported libraries.