However, it can still be acted upon if it is reported for plagiarism.
There are no update for those who never reported yet 
Have you actually read entire topic?
I think the sentence reads fine as is. It's the "issue" that's being referred to (in the sense of "a matter of discussion"), instead of the "problem", I think (i.e. if you replace on-topicness with off-topicness, then you'd also have to replace substantiveness with non-substantiveness).
Hmmm... you have a point but I am not convinced yet. I guess it's debatable
[...]
Your name really caught my attention... Have you read Ayn Rand's Atlas Shrugged...? If yes, you have my sincere congratulations! May you convince other as well to read that impressive book...
If you didn't read it though then you should... especially for wearing this name
At least, it is much more worth to read that book than some topics I found recently in Off-Topic board 