They did not mention it at all in the dev update, and now there is a following update in the patch notes:
Fixed an issue where legacy items migrated from characters created before Season of Hatred were capped at Item Power 520 instead of 540.
So I’m pretty sure they’re giving the middle finder to Eternal players once again, but didn’t even bother justifying it.
Overall, some of the patch notes have good stuff, some have pretty bad stuff. For example, only Ancestral legendaries can drop with the maximum aspect on it. Normal legendaries have a lower version of the aspects.