During the attack on the Leaf Village by the Sand and Sound Ninja, Orochimaru revealed he had learned the Jutsu that allowed him to jump bodies and thus achieve a form of immortality. during their fight Hiruzen Sarutobi used the Reaper Death Seal Jutsu to seal away Orochimaru's arms and thus taking away his Jutsu.
Near to the end of Naruto before the Time Jump to Shippuden, Orochimaru tried waiting for Sasuke to reach him but in the end had to jump to another body but according to this answer
Orochimaru regained his arms during the 4th Shinobi War, well into Shippuden
so if Orochimari couldn't use Jutsu before the time skip into Shippuden, how was he able to jump bodies?