It's just an observation from one TC visit where I watched him fairly closely (the one where he "broke out"), so I'm certainly not a Jacobi Meyer's expert. The rest of it comes logically from some of the scouting done and his combine stats.
He's not going to outrun people with is 4.6 speed, and he's not going to out quick them with his 7.1 3 cone. So to me his assets are his hands, ball tracking, and route running abilities. Those are the skills that usually do best against zone coverages and struggle against pure man. Another clue was his 11-12ypc in college. So he clearly he's been an underneath receiver his entire career as a WR. Hard to believe that will change in the pros.
Like I said, he's a nice camp story who has overachieved expectations and will likely make the September roster (barring injury). However the Pats have 3 guys (Meridith, Gordon, and Thomas) in the wings, any one of whom could make Meyer's stay with the team a short term event.