Our political parties’ primary/caucus systems are more flawed today, because currently the percentage of unaffiliated (independent) voters exceed the percentage of voters affiliated with either party, than any time in recent history. Until these flaws are addressed, superdelegates are expected to access and mitigate the risk of nominating a candidate that is unelectable, especially by a wide margin.
The linked article suggests that Hillary Clinton release the speech transcripts to the public so as to narrow the trust-gap created between Bernie Sanders’ supporters, which should also be a major concern of the superdelegates. Short of making these transcripts public, the superdelegates request these transcripts be released to them immediately, so they can assess the risk they may pose, if released by a GOP supporter after the Democratic convention.