Adjective
(broadly) Of or pertaining to literalism or literalists.
(specifically, and most commonly) Using a method of interpretation regarded as woodenly, inflexibly, or simplistically literal in its perceived neglect of such considerations as context, genre, and intent of the author or artist; overliteral.
Source: en.wiktionary.orgOpen theism does not rely upon a simplistic, literalistic hermeneutic, as you suppose. Source: Internet
So, Jersak has conflated the two things into a caricature of Open theism that goes: Open theists have a literalistic hermeneutic and think God changes God’s mind, but God is good and nonviolent, so Open theists are wrong. Source: Internet