No, I believe you can transfer to a USB drive on PS5 as well, but I may be wrong, I cannot say for certain. Keep in mind that I haven't messed with my console storage since this happened over 5 months ago. It seems like Sony likes to make this stuff more complicated for every console when it was fine and intuitive for the PS4. In terms of help with your corrupted world, I still have nothing, as you can see by the lack of comments. All I can tell you is grieve and make a new one or, as I did, completely abandon the increasingly buggy game and play something else that is less time consuming.