This is made up. His targets weren't from the slot. He didn't start in the slot and run routes against a CB3. He lined up wide 80% of the time and happened to be in a position that FO consider a "Slot position" when he received the ball. Which means the Ravens had him running a lot of inwards breaking routes. But he's still lined up vs CB1 most of the time unless vs zone. It's not the same thing.
This is nothing to do with Brown as a player and everything to do with the Raven's offense or Lamar's limitations as a passer. As you can see from this passing heat map from the last 3 seasons. They pass far more between the numbers than any other team in the league. And far less outside. 60% of Jackson's passes last year were between the numbers.
A recent quote from Michael Lombardi, but you can find similar all over the web.
"When at Louisville, he threw a great deep ball, on over and post routes. Jackson struggled even back then at throwing outside the numbers, right or left. He is widely erratic in that area, which then shrinks the field and allows the defense to pack its defenders inside. Everyone now knows he is best when throwing the ball in the middle of the field, between the numbers, which is why tight end Mark Andrews was the target on 153 passing attempts, the most on the team."
In 2019 he completed 71% of his passes between he numbers with a 108 passer rating. Outside the numbers only 48% completion rate and a 61.7 passer rating. Worst in the league.
From PFF,
"Jackson has been more effective throughout his NFL career targeting the middle of the field than he has been going outside the numbers, as he does in the play above. Even in his MVP campaign last year, Jackson ranked just 16th in
PFF passing grade outside the numbers (75.8). By comparison, he ranked fifth in PFF passing grade between the numbers (92.4). That gap has only gotten wider this season. Because of that, we may see more teams try to take away the middle of the field against Baltimore, particularly with a lack of depth out wide behind
Marquise Brown."
Which is also why that offense was holding him back.
You must be registered for see images attach