Looking at the two repos it's not clear to me whether it's even a fork or not. The issue owner didn't state which files he thinks are forked from the Gemstash repo. Also, MIT license is a permissive license and does allow sub-licensing, so his comment that you cannot change the license is not entirely correct. However the intern should have kept the original MIT license along with the Apache license, adding a note that MIT license only applies to specific portion of the project (that is, if he forked that repository in the first place..)
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Looking at the two repos it's not clear to me whether it's even a fork or not. The issue owner didn't state which files he thinks are forked from the Gemstash repo. Also, MIT license is a permissive license and does allow sub-licensing, so his comment that you cannot change the license is not entirely correct. However the intern should have kept the original MIT license along with the Apache license, adding a note that MIT license only applies to specific portion of the project (that is, if he forked that repository in the first place..)