That's not what happened. If you actually took the time to see what happened you would see. Go to the Analysis section. You will see a chess diagram does exist.
What happened was I posted again, a second chess diagram. Then I deleted the post to correct the text. Then, I went to paste it back in the correct way, and that is how it got filtered. You will see the top diagram is NOT filtered.
The restriction you are referring to is simply the number of games you have to play before you can post links and images. I have already passed that limit.
I typed Qb6 when I meant to type Qc6 and give a video link to a reply. When I went to edit, this site stripped the quote formatting and removed the links to the video as well as the chess diagram. I am sure it was automatic, but I think you should give us 3 tries at least to make sure it wasn't a legit edit.