This is true but not completely. You will only get pip when you install the binary downloaded from python.org. On osx, people use brew, on Debian, they use apt. It is most likely only Windows people will download those binaries but actually they use Anaconda, WinPython instead
I'm actually getting tired of package managers reinventing the wheel (literally) every time they want to install something.
In production when I deploy a django app, now I might have two libraries in different places in my system. One from the OS, and one from the pip dependency.
The problem with that command is that it also counts the Makefile, Dockerfile and other supporting files. It also counts every implementation step (so lots of repeats in the LOC). However, each implementation does have a "stats" rule. So the following command at the top-level can be used to a get a nice summary:
for i in $(make print-IMPLS); do \
s=$(make stats^$i | grep total); \
printf "%-9s %s\n" "$i" "$s"; \
done | sort -n -k2