Yup. If he "was working on adding Ruby 2.2.0 support to Jekyll" that assumes that Jekyll which works with Ruby 2.1.0 doesn't already work with Ruby 2.2.0.
And if he's maintaining something significant in Ruby, how is he not aware that Ruby breaks compatibility even in patch releases...
"MINOR: increased every christmas, may be API incompatible."
[1] https://www.ruby-lang.org/en/news/2013/12/21/ruby-version-po...