It's referring to https://en.wikipedia.org/wiki/Hype_cycle which is meant to describe the pattern of hype -> disillusionment -> eventual larger-scale adoption that often accompanies new technologies. Seems like a fair estimate that it's near that peak given that Bitcoin has broadly reaching excitement around it but few similarly broad use cases as of yet.
Would you really argue that Bitcoin has "large scale adoption"? Most people aren't using it yet apart from cryptocurrency enthusiasts and currency speculators.
Why do you think they are at their peak?