I mean, it's not really even time travel lol. The memories in BotW were just Link remembering **** that happened in the past, and considering we see the moment Link falls and is escorted to the Shrine of Resurrection, we pretty much can piece together the timeline of events, where he gets nearly killed, and then put into stasis until the game starts.
Then there's the sequel and, considering we see Zelda with long hair throughout all the first game's memories, up until you meet her again at the end, and we see Zelda in the BotW2 trailer with EXTREMELY short hair, either Zelda used magic to grow her hair out, or it's 100% a sequel lol. Doubly supported by the fact that we see Hyrule in a post-calamity state.
....I guess I'm starting up hair theory now!