No where, what so ever, does it have any proof that the iron lords survived, let alone evidence stating that they have any association with the vex.

But, do we have any real evidence that they all died? For example, this may be one of the reasons Efrideet will not disclose anything about her pacifist colony. Some of the other Iron Lords could be there. Not saying they are, but what you take as given above does not necessarily follow from the information you presented. Is there more evidence that they all died?

The fact is, we don't know. All we have is a sample size and a quote. You can't prove for or against in this case, unfortunately.

Interesting. Thanks for the discussion. The lore definitely adds to the game.