Crucially, this linkage does not depend on whether there are libraries for what you're trying to do or experience level in the language. If coding a particular feature takes 1000 lines of code in C vs. 100 in Python, you'd have to assert that a programmer can write (and maintain) code 10x faster in C than Python. Since roughly the same amount of conceptual energy goes into each line of code, this is tantamount to the assertion that a programmer writing C can think through concepts 10x faster than when the same programmer is writing Python.
There's a reason the field invented higher-level languages, and it doesn't entirely have to do with novice programmers.