The route to an AMS Article is no different than a route to a Discussion Thread. the route to a Resource a route to a Media Item etc etc etc..
The route to a Discussion Thread uses the route
threads
and the route params
title
and
thread_id
The route to a Resource Item uses the route
resources
and the route params
title
and
resource_id
The route to a Media Item uses the route
media
and the route params
title
and
meadi_id
The route to a an AMS Article uses the route
ams
and the route params
title
and
article_id
If your goal is to create a route filter for a specific article, that is doable and is done in the same way that you can do it for a single thread, single resource, single media item etc. There is quite a bit of information on this at XenForo.com.
Also, any route filter that can be done for Threads, Resources and Media Items, can be done for ANY Content Type that has a route.
Another to check, any route filters have to use the default route, you can not create a route filter using another route filter. eg, if you created a filter to change the default route
ams
to something like
articles
, you can NOT use the route
articles
in another route filter, you have to always use the actual route
ams
. This is not an AMS thing, its how the Route Filter System works.
Hope that at least points you in the right direction
PS... when asking for Route Fitler help, post screenshots of the route fitler(s) that you are trying to create.