I’m not sure very many actually read the article you posted.
What I took from the article is that more Republicans agree with the libertarian view of the role of government.
People want to be left alone. They don’t want to be spied on, they don’t want to have universal health insurance requirements dictated by the government, they don’t want a government “safety net” of free cell phones, never-ending unemployment, etc that is destroying our economy while running up the debt, they don’t want to be felt up by TSA agents.....and the list goes on and on and on......
On top of all that, they want the Constitution to be upheld...things like the second amendment, the fourth, etc.
Libertarian ideology and Republican ideology are not all that different on a lot of the issues that are front and center today.
I had a similar thought. The one area that jumped out for me is the gap between the "social conservatives" and libertarians.