Yep, I very much agree with you - Given the spawns occurring at that early point on this particular expeditions, it's unlikely that the mechanic would already have procc'd in the time between expedition start and the recording start.
BUT: We would have to make the assumption that OP did in fact not procc the mechanic, but that would be an assumption.
Given the fact that OP is a glass cannon build with no defensive mods, it may not be out of the realm of possibility that the death prevention mechanic might have procc'd before, even from OP being hit by weaker mobs.
But this is all based on assumption, as I mentioned. Us seeing the full run, start to finish would allow us to specifically identify whether the mechanics are triggered as intended and then going into cooldown (and is that cooldown too long?) or whether they are simply not activating at the first opportunity.
Edit: Furthermore, without knowing OPs full build, we can't assume that...
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