"See JSviolin xxxxx"
If anyone gets confused, simply reply "replace violin with synonym starting with f"...
This reminds me of when YouTube banned URLs in comments (I don't think they do anymore), so people started posting pieces of them (like video IDs, the part after watch?v=...) with hints instead: "see video xxxx".
Likewise, I can refer to this page with "see HN 20122583".
The loss of being able to post a link is not good, but in no way does it absolutely stop communication. In fact, it will just cause "euphemisms" to appear, and further exercise human creativity.