Every new message board post is on some topic. So posting a new topic declaring it as being 'off topic' makes no sense. If you are responding to a post or diary with content that differs from that of the original content, then yes, that is 'off topic'.
So stop being stupid.
That is all.
At press time, Harbaugh had sent Michigan’s athletic department an envelope containing a heavily annotated seating chart, a list of the 63,000 seat views he had found unsatisfactory, and a glowing 70-page report on section 25, row 12, seat 9, which he claimed is “exactly what the great sport of football is all about.”