Hi! Please make sure to follow the sequence as described here. A common mistake is looking at the command palette before being connected to a GPU. The fallback runtime option will not appear in that case. It will only appear after connecting to a GPU. I just tried it now and it’s still there.
Hope this helps!
Note: The team is already working on an update for the assignments without needing the fallback. We will be deploying this very soon. Thank you, and sorry for the inconvenience!