That's a poor stats to be polite. SQL is no programming language, PL/SQL and its variants are. Without scripting languages you can't embed much logic in it.
I also wonder how they count multi users, I can easily mark 10 of those if not more.
> HTML/CSS were the most commonly used programming languages
I am sorry but that can't be taken seriously, then I know a ton of Excel developers, and wait till I get to Powerpoint ones.
Curious, but in what way? Java still drive lots of enterprise and banks, and I cant' say I've seen any Node.js in the backend at any of these places.