Answer
The answer is no, Mousa Dembélé never won the Premier League. He played for Tottenham Hotspur from 2012 to 2019, and during that time they never won the Premier League. In fact, they only finished in the top four once, in 2016-17. Dembélé was a key player for Tottenham during his time there, and he was named to the PFA Team of the Year in 2016.