With the release of Patch 10.2.5, here are the specifics of the Tindral nerfs and a stealth nerf to Nymue.
This nerf wasn't mentioned anywhere:
This should make it slightly nicer in melee, especially when soaking the red flower.
Some of the Mythic Tindral nerfs were very cryptic. Here are the specific changes:
This allows more time before you need to more for the Fire Beam, which is useful when learning the encounter. With the timing, you'll likely still need to break all the roots at 0:50 still.
Why Phase 2 and Phase 3 have different Flare Bombs being removed is unclear.