Yes, it should be not active anymore, as inactive flag or no support flags should expires in 3 years as per my knowledge (i might be wrong about the type of flags though)
This applies only to type 2 and type 3. Type one doesn't
expire
<...>
That now makes sense.
Edit:
Or this will also work if one of my trust list includes this user?
Yeah, one of the members in your trust network has the user included in their trust list, and it's none other than the admin