Why is Twitter Bootstrap not a skill, but JBoss, Hibernate, Django, heck even Node.js, etc. a skill (perhaps I'm putting words in the author's mouth, but I doub

Why is Twitter Bootstrap not a skill, but JBoss, Hibernate, Django, heck even Node.js, etc. a skill (perhaps I'm putting words in the author's mouth, but I doubt he'd have the same opinion of a resumé with those skills listed)? According to this guy, you're only allowed to list the languages you use as skills, not the tools you use within those languages.