Yes, libertarianism is quite close to anarchy or minarchy. It looks like such sentiments are very strong in places where goverment has failed their people for dozens of years, in comparison of Europe for example.
Any ‘anarchist’ that is pro-capitalism is generally not regarded as anarchist by the wider anarchist movement.
Fun fact: befor the modern US meaning, libertarian used to mean anarchist-communist as a way around french authorities banning the word anarchist in the late 1800 if I remember correctly.
This first use was in the 1850's I believe. Left wing libertarianism predates the right wing use of the term by about a century.
During that time it was very much a term that encompassed anarchists and some other socialists such as libertarian Marxists.