I don’t see what particular disadvantage accrues to the defendant by not seeing the claimant’s DQ, it’s only a list of preferences and contact details and in any case some of the preferences are overridden by the defendant’s.
It’s worth noting as a general sign of incompetence I guess.
Court staff are generally not to be trusted unless it’s in writing, and as far as I’m aware they’re wrong in this particular case.
The N180 form itself states
Once you have completed this form, please return it to the court at the address shown on the form N149A Notice of proposed allocation to Small Claims Track.
You must also send a copy of this form (N180 Directions questionnaire) to each of the other parties in this case.
So you were told complete rubbish, weren’t you?