Actually the more I ponder it, the more it stops holding up and I don’t really care for it.

• The show really undercuts Kirk (IMHO) by having his plan be 1) risk killing himself by accident by hiding amid the radioactive phaser whatever it was to establish a bluff, and then spike his CO’s drink with a high potency drug he only just learned of and he shouldn’t be playing around with because, I don’t know, he’s not a doctor. This is smarter and better for the character than showing us Kirk staking out the moral high ground, standing that ground, and finding another resolution?
• M’Benga deciding to not only go along for the ride on this but take the blame doesn’t do him any favors either. I know they’re setting up M’Benga’s departure to mesh with TOS, but if this story went “M’Benga takes the moral stand and relieves him even though maybe Starfleet won’t support that stance after the fact” that would have been a stronger character point too.
• Really, while this sets up “M’Benga will wind up departing but Kirk will be cool with him coming back later in TOS because he knows the true story”, the idea that M’Benga is allowed to stay in Starfleet after admitting to drugging his CO to have an excuse to relieve him of duty is kind of wild. Or at least how that came to pass would be a good story (that we’ll never see).
• Watching this again, I hear Picard saying Starfleet’s first duty is to the truth and wondering when exactly Starfleet got there, because it’s sure not in this episode.