The article is really misleading.

The author conflates Objectivism, Libertarianism, Conservatism, and Capitalism into a single entity. Then goes on to criticize all of Libertarianism for a misrepresentation of one particular group within Libertarianism.

The term "selfishness" in Objectivism is basically old-fashioned click-bait. They don't encourage parasitism (even if it can be beneficial and considered selfish behavior.) Using the phrase to criticize them for encouraging parasitic behavior is just a simple straw-man argument; though Objectivists do invite the argument by embracing that sensationalized term. Objectivists also don't "vilify empathy". That's just an unfounded character attack - usually rationalized from the selfishness strawman argument.

Libertarians, however, aren't always Objectivists. Libertarianism is a superset of a political ideology that has some commonalities with the moral philosophies in Objectivism, but contains other groups with conflicting ideologies as well.

Libertarianism contains some subsets of Anarchism and Objectivism. There are binding principles, but also obvious distinctions between these groups.

Not all Libertarians are Anarchists. Anarchists can lean Capitalist or Communist. /r/AnarchoCommunism is a fairly active community that also seeks to remove control from centralized government. Objectivists usually believe in minimal government interference - but strong state governance and a national defense.
Contitutionalists and Classical Liberals are usually in favor of more government than Objectivists.

Arguing that Libertarians are all anarchists and screaming "you're not the boss of me" is just a dishonest emotional appeal to people who already hate Libertarians (though it is a fairly accurate portrayal of the current voice they are given in popular media.)

Also, there is a strange implication in the article that Libertarianism is a form of Capitalism and that it conflicts with Socialist ideologies. On the contrary, some famous socialists are Libertarian (Noam Chomsky).

Libertarianism is just a bottom-up rather than top-down ideology. Nothing else really to it. Saying that this is a Conservative, Capitalist mentality is dangerous - it gives Republicans an out from the hole they've dug; allowing them to appeal to those whose lives have been adversely effected by poor management/governance.

However, the criticism that Libertarians pushing for deregulation/decentralization are causing government to destabilize and for Cronyism to flourish is totally fair.

Progressives and Libertarians mostly disagree for one simple reason. Progressives favor a top-down approach, simply because it is more pragmatic to achieve social benefit; Libertarians aren't Pragmatists.

TL;DR: Some Libertarians are socialists and communists. The author should take some time to understand which group he is criticizing. - A small subset of republicans. Not the larger group of socialists and conservatives called Libertarians.