It is true. Brabantio accuses Othello of winning his daughter's heart through witchcraft:
O you foul thief, where have you hidden my daughter?
Damned as you are, you have cast a spell on her;
Because I'll restore myself to all things of sense,
If she wasn’t bound in chains of magic,
Would a maid so tender, beautiful, and happy,
So opposed to marriage that she shunned
The wealthy, curled darlings of our country,
Would she ever have, to merit a public joke,
Run from her father to the black bosom
Of a thing such as you, to fear, not to delight in?
The world will judge me, if it is not evil in feeling
That you have cast disgusting spells on her,
Abused her delicate youth with drugs or minerals
That knocked her out. I'll have it judged;
It is probable and tangible to thinking.
I therefore arrest and attack you
As an abuser of the world, a practitioner
Of the forbidden and illegal arts.
Seize him! If he resists,
Subdue him at his peril.
Brabantio is convinced that his daughter has been bewitched. He accuses Othello to his face of subduing his daughter with the arts of witchcraft. Brabantio proclaims that his daughter would have never submitted to the black bosom of such as a thing as Othello. Brabantio is accusatory in his speech. He is also racist in his speech to Othello. He does not hold back his insults. He will never believe that his daughter Desdemona has become Othello's wife based on her own good sense. Of course, Brabantio believes she has been drugged; otherwise, she would not have given in to a thing like Othello.