The poster said "(even though you obviously can)".
People will try all sorts of weird language experiments, so it's no surprise those libraries exist. But do you really expect a significant number of web developers to shift over to C, just because it's technically possible?
I did generalize above, but when I said "simple website" I really meant the usual simple website one the web, not firmware/embedded stuff. I kinda said that because I already wrote one in C including a basic CGI library, as well as a mid-sized one with Rails, and the difference clearly falls into "C doesn't try to be good at website creation, but you can obviously do it" (and in some occasions you just have to). I'd also add that Roller Coaster Tycoon was written in Assembly, but it's not a language that is particularly good for game dev in general (but still a completely general purpose programming language).
Micropython is not really python (which by definition is defined by PEP and CPython implementation), it's a language largely similar to python 3 since you can't just pick a python program or library and run on it at all times, but it's not really a relevant discussion (and it's nice to have multiple variants of a language you like that are good for multiple purposes, which solves the bloat problem as long as you use only one of them at a time).
Regardless, I hope Julia gets to the point that you can target as many places as some of those languages even if it's not nearly the best in each domain (like WASM, embedded, OS stuff, shared libraries).
Actually Assembly is how most 8 and 16 bit titles were written on, higher level languages were the Unity from 80-90's gamedev scene, Roller Coster Tycoon isn't alone.
Quoting the relevant quote "you wouldn't use C to write your simple website", except that is exacly what EE does when on device memory is measured in KB.
C++ would be safer, but the C89 culture reigns in such domains.
People will try all sorts of weird language experiments, so it's no surprise those libraries exist. But do you really expect a significant number of web developers to shift over to C, just because it's technically possible?