Are promotional offers visible in the iOS subscription settings?

The question:
Are the time limited Promotional Offers, visible for the user in the subscription settings?
Or will the subscription just display the standard price here?

The problem:
Subscriptions within the same group are visible for the user in his App Store account or in his phone via:
Settings > AppleID > Subscriptions > App > List of all subscriptions in same group

This way a subscriber could switch to a cheaper subscription of the same service level without the devs control. (I have used this often to save some money...)

We want to avoid this, but can't find any info if this could happen with Promotional Offers too...