Decided to go into the source again, and yes, it's mostly implemented in Makefiles, but they are wildly different from the kind of makefile discussed in the art

Decided to go into the source again, and yes, it's mostly implemented in Makefiles, but they are wildly different from the kind of makefile discussed in the article, with considerable amount of machinery in macros and external C programs (whole "features" thing) to the point that individual makefiles in subdird probably wouldn't parse right if not executed through kbuild wrapper