Yes, it's clear Gordon has applied a mastering limiter to the tracks he delivered to Bethesda, and given that the style of the music involves heavy processing/effects and multiple levels of compression, a somewhat aggressive mastering limiter seems appropriate here.

But your point about "increased dynamic range" due to the editing errors is a distraction from your claim that Gordon applied a mastering limiter (which he clearly did). It creates ambiguity, because you're using it in a way that's not aligned with common usage in this context. That's part of why you're getting pushback.

In any case, if we want to try to answer the question of why the OST has low dynamic range (in the mastering limiter sense), I am somewhat receptive to ndepoel's argument - it seems reasonable that in-game tracks could be mastered more aggressively, and with lower dynamic range, than what would be appropriate for a proper OST release. Caveat: I haven't done mastering work in the context of game audio so I can't say if that's common practice, but it seems a little more likely than not.