The video was probably fine and the attribution is good now.
Its okay! I wasn't really aware of the differences between the different CC licenses until recently and still I am learning. I liked your post btw, I don't want you to feel like I am picking on you or anything, I swear I do this to a few people.
If you want to use youtube video embeds, you can search youtube for CC0 videos (there is a way to do it) and a lot of content creators will likely say sure for you to put it in (its even more lovely when they have a website that answers that specific question, however if something says NC (Non-Commercial) I would avoid it as steemit could, by some, be considered commercial)
Anyways the attribution looks good.
I'm glad you liked the post, and I stay away from NC for the same reasons. I don't think you're picking on me. ;)
However, my first reaction when I saw only the bot post was to be a little irked. Both the name of the bot itself and something about the text made it feel a little like getting hit with a comment from cheetah.
I'm trying to think of suggestion for rewording it so it comes off more as 'We'd like to help you improve your articles' and less as a policing-bot type of thing. Perhaps something like: