In principle I think this is good. These are useful tools as shown in the first video, helping them safely arrest a suspected thief. And having a policy like this is a good step to ensure they aren't used for ubiquitous surveillance that enables the sort of post-hoc warrantless (and unjustifiable) invasions of privacy we've seen with Flock cameras.
That said, I hope the official policy is more air-tight than this one-sentence version. "with or in lieu of vehicle pursuits" is tautological, only constraining the target to be a vehicle [edit: or does it require they follow a vehicle pursuit policy specified elsewhere? unclear to me]. And can anything be a "training exercise"? What would the consequences be anyway if an officer violates the policy? [edit: I'm also wondering now how tight their policy on an "active criminal investigation" is. When there's significant officer time involved, there's some inherent limit on how silly/vindictive/... they can get, but with enough drones, that could go away.]