Let's not forget leaders of the host country have said their previous experience with PNG LNG included errors that they were determined not to repeat. I would also suspect that while XOM has their own preferred "boilerplate" for contracts a good part of those T&Cs are based on international law. Then you have the bidding process that led to the signed term sheet which was determined to have consideration acting towards IOC's best advantage.
All of which contributes to my belief these contract documents are long and complex. While XOM may come in to the final drafting with certain strengths due to their size and experience, to state that they alone have or will dictate all terms according to their exclusive advantage is a statement that simply can't ring true.