What is the ruling on using computer-drawn images of living beings in educational videos that aim to reflect on God's creation and disseminate knowledge, and is it obligatory to delete a video that contains them, or is it permissible to keep it?

Computer-drawn images fall under the category of forbidden imagery, just like hand-drawn images, because it is actual depiction, and not a mere نقل (transfer) of an image created by Allah. An exception to this is if the image is incomplete in its creation such that life cannot be sustained within it.

If the image is complete in its creation, then it is obligatory to remove it from the video, or to remove what would prevent life from being sustained within the image. It is not necessary to delete the entire video.