You can delete them. In your creation screen, click the trash can (1). Then click the three dots (2) and delete creations/tasks. If you add sound, the three dots for me at least aren't visible but they are still there.
You can also go to your video page and you have to play them I believe and in the bottom corner is a trash can that kind looks like a christmas present. Not sure why they change the icon for the trash can.
And DiGen does allow nudity. You just have to use clinical wording like breasts instead of boobs. It is nearly impossible to get it to do sexual stuff but it will if you work for it. I recommend a subscription for that though because it'll take several tries.
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