An agent is someone who makes money managing players. The players employ them, not the teams. When it comes to contract negotiations, the agent and team are on two different sides.
Having an agent interested in signing someone is a strong indication that that person is considered draftable, but every agent has people signed up who don't get drafted. That's because the agents, if they want to stay in business, can't afford to just chase those players that are 'certain' to be drafted. They have to also look at those that might not get picked until late rounds of the draft...or not at all.
It's a positive sign for Deon, but it doesn't mean that he'll be drafted. After all, agents chased Ty the previous year, and he wasn't selected. The agent's perspective is different to the teams. A good agent will have a good understanding of what the teams are looking for, but they can still get it wrong.