If I understand the claim correctly, Arete gets results based on the following:
- Their ability/flavor is related to time
- They can kill people
- They can heal/delay people
The first is obviously NAI, but Vigilantes and Doctors are both strong Town roles.
As a Town Investigative, I think most results they could get would not be very AI (Unless “Having access to the factional kill” counts).
I don’t see it being useful other than for catching people in fakeclaims and kat is probably the worst target you could possibly select for that.