It says right in the article:
"The move doesn’t come as a huge surprise to Tennessee. The consensus from those covering Tennessee’s recruiting seemed to believe that Clemons wouldn’t be a part of the Vols’ 2019 class one way or another. Clemons ended up taking matters into his own hands rather than waiting around for a decision to be made for him, and he took his services to Memphis."
So no, I wouldn't call this a big deal.