Bolded language when stating a broad knowledge of a language

To reproduce this, follow these steps:
1. Go to http://osrc.dfm.io/Aaron1011.
2. Scroll down to "Aaron is a serious **Python** expert".
3. Note that **Python** is bolded on the page.
4. In the same sentence, see "with a surprisingly broad knowledge of JavaScript as well".
5. Not that JavaScript is not bolded.