I tested this in my non-tadpole playthrough some time ago.
Yes the options to convince party members to use the tadpoles and when the Dream Guardian speaks to you it has that dialogue but, the most important aspect imo is when in act 3
the Emperor offers you the option to use the Astral Tadpole, you won't have to pass a Wisdom check to reject it and the narrator doesn't have the line about you feeling dissapointed. As long as your character hasn't consumed the basic tadpoles you'll remain free of that consequence. This could be useful for players who don't want to use the tadpoles on themselves but don't mind giving them to characters that want them like Astarion or Gale.
Also when I asked about this UI behavior thing on Reddit someone commented that the UI will activate anyway on Act 3 upon reaching certain locations. I haven't been able to test this.
