Lets set aside my personal belief that suckless is a satire that too many people started to take seriously...
Always using the latest git version as done in the article doesn't strike me as the most sane thing to do if you "just" want to use the software especially as suckless offers version tarballs.
But suggesting sudo make clean install
to build is really not okay...(and also not how the suckless tools I checked suggest it). You cloned (or better extracted the tarballs) as user...there is not a single reason to build the software as root. If you have to install then do it in two steps, build as user and only "make install" as root.