It is irrelevant to free choice whether its choice is impressed by a prior cause, so long as it follows practical judgement
In their phrase, it is 'irrelevant' to free choice whether its choosing is impressed on it by a prior cause or not.
What matters is that the choice comes from a judgement of the practical intellect, which is able to weigh different kinds of good on opposite sides and set them before the will.
Latin
X. Censent enim, ut loquuntur, impertinens esse libero arbitrio utrum suam electionem sibi impressam habeat a causa priori, an non: modo electio illa fiat ex judicio intellectus practici, qui diversas boni rationes circa opposita possit considerare, & voluntati proponere.