I don't agree with you.

Question

You example : Sam fait de l'aïkido.  Sam does aikido.  How can you explain the right  answer as ".... going to dance lesson..."?

Accepted Answer

Without the full text of the question you can’t get a specific answer here. You need to include the full question, or if you think there is a mistake in a quiz, submit a report from the quiz directly.
If you are referring to an example of “faire de la danse” indicating dance lessons, that is explained in the lesson. Some activities have their own verbs - danser/nager/skier are 3 examples in the lesson. In those cases using faire de .. indicates regularity or structure to the activity.
There is no verb (aikido-), so that distinction does not apply.