It isn’t entirely clear what it is that you are reporting, a link to the topic would have been helpful. Though you are presumably talking about this one https://community.avast.com/t/what-is-ritrag-com/879487/3
The forum software when you post a link if in the Case of Securi there is a site description it incorporates that in the post.
I don’t see anything in that post that looks like an add.
EDIT: I have posted a number of these links that ultimately have a description of the site - see https://community.avast.com/t/web-shield-alert-on-qnap-qsync-exe/879485/4