Lets talk about skelos cultist master armor

[Tephra]

I never saw them explicitly state they would return in 3.0, only that they would be made available again.

PC Update 2.7 - Discussion Megathread

Hey fito, These are not account-level rewards, just normal item drops like anything you would normally encounter in the exiled lands. We intend to keep them a part of the game, but once the event is gone you’ll have to get them a different way (not yet determined). Hope this helps!

However, they did say that the Grave Matters event will be returning in 3.0.

Conan Exiles Update 3.0 Livestream!

So, unless they decided to remove the old items from the event for some strange reason, then they should be returning in 3.0.