It appears that he deleted a listing from RubyGems, a (the?) package distribution platform for Ruby. Yes they probably have several copies, but now Bundler won'

It appears that he deleted a listing from RubyGems, a (the?) package distribution platform for Ruby. Yes they probably have several copies, but now Bundler won't work until they re-host & re-register the gem. Deleting from RubyGems was probably more impactful than removing it from Github. I'm unfamiliar with how Chef works, but I wouldn't be surprised if a `bundle install` was part of the workflow. Maybe someone else with more experience here can fill in some gaps.