It actually says "The alt-right, or alternative right, is a loose group of people with far-right ideologies who reject mainstream conservatism in the United States. White nationalist Richard Spencer coined the term in 2010 to define a movement centered on white nationalism, and has been accused of doing so to whitewash overt racism, white supremacism, and neo-Nazism."

Did you see the video?

I can't say with authority that this guy invented the term (wikipedia makes that claim) but he is certainly the on responsible for making the most people familiar with it.