Curse seal being the immortality jutsu oro was looking for?

[xXFLAVORSXx]

Now as we've seen for manga 593 orochimaru can be brought back thorough the curse seal so what if this was the immortality jutsu he was looking for in part 1 in the flashback with hiruzen? would it also be safe to say he knew he could be brought back like this back then?

 

[Gèckö]

maybe im unsure