Board Thread:Theories and Speculation/@comment-45444155-20200506094659/@comment-4974066-20200522173148

It's been explained before that a shinobi can either use a jutsu that creates an element with chakra or use jutsu that controls pre-existing elements with chakra. Both are possible depending on what the user wants to do and how much chakra control they have.

Naruto was likely granted the other nature transformations from the biju or from Hagaromo's blessings. The 4th Databook shows that he currently has all nature transformations.