Yes we've added that to the sentence which now reads 'ers sbel' = 'for a while, for a spell'
The sentence with 'sbel' on its own was deleted but is still not gone from the system unfortunately.
When will these be taken off Duolingo if you've done your bit and removed them?
Your comment was left 3 months ago, and yet it is STILL in the course, and there's a lot of other words/phrases where the comments say the same thing "it's been deleted" . . . . and they're still there and we're still being marked as "wrong".