There are some clues about the new Birth of Herobrine series we users talk about. So here is a list. The basic plot is that Gameknight999 traveled into the past.
|“||Maybe I trained him.||„|
-Gameknight talking about how he got the Two-Sword method
Gameknight may have trained Smithy to wield two swords, which is a small clue about the time traveling.
Oxus the creeper King, told Gameknight999 he gave him a message millions of years ago in the Great War, which is a major clue to the Birth of Herobrine series and the time traveling.
In Elytra Perils, Gameknight said that the 'time traveling scared him a bit' finally confirming he time traveled, and fixed the timeline.