That’s my take, at least for groups. Solo will probably depend a lot on how much the difficulty changed, but for groups probably not so much because they’re inherently so much more efficient anyhow.
At the end of the PTR? Absolutely. The XP was insane, especially for solo.
As of this patch? I don’t know. Blizzard could have made adjustments 3 ways (xp rate, drop rate, diffculty) and they chose to go after all 3. Feels, again, like they used their sledgehammer rather than their scalpel.
When they specifically state that they made Lunatics and Meteors more deadly, it’s pretty easy for me to imagine their +100 tier adjustment was to make it harder. In this PTR cycle have they made any changes to make EN easier, because every one I recall was done to make it harder.