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They plan to get a more polar orbit each time they get close to Venus: https://www.esa.int/ESA_Multimedia/Images/2020/01/Solar_Orbi...

Not sure if 33° angle in 2029 is the final "polarity" or if they'll keep tilting after that.

Wouldn't the tilt affect the gravity assist of Venus?

The planning of sure, you've gotta make sure you're crossing the plane at the time, but gravity assist itself is otherwise the same though.

At the time, every time, and the position of Venus changes with every orbit. But I guess the folks at ESA are proficient in math.