I too get that impression from him.
Dembélé was a street player from a poor suburb in a French city. Like Mbappé and a lot of our French players.
Now some have the brain to go a lot further, others don't.
Dembele has what it takes to be great, he was superb in Dortmund. But in Dortmund he was trusted and more importantly, he had players running around him.
It's just awfully hard to succeed in a poor team like Barcelona has become, with no movement, no offensive runs, a team which bets everything on Messi individual skills. Even Coutinho has trouble here, everybody outside Messi has trouble here because it's awfully hard looking good while playing motionless slow building football where nobody makes runs behind. Xavi and Iniesta are gone, it's time to move on.
Now does Dembélé has some street player defaults ? Yes he does. Sometimes thinking too much about dribbling, sometimes afraid. But he's also a genius, that's why you bought him 150 million $ Sell him for 80 million$ and he'll be back over 100 next year, simply because in nearly any other big team, he'll get people who run around him and he'll be racking goals and assists again like he used to in Dortmund.
Does he have some problems due to his past being raised in a poor suburb ? Yes he does.
But he's a nice guy and he can make it if people believe in him like Tuchel did in Dortmund instead of wanting him to fail like every idiot on this non-fan forum. And if Barcelona becomes a better team again, with more movement.
Dembele's pass rate is bad in Barcelona because there's not enough people moving around him.
Everybody has a bad pass rate right now in this team and the team loses even when he's not here so maybe, maybe the problem is elsewhere. Just saying.