I don’t believe suspended users appear in the user directory.
There is a setting that would allow them to be findable in the search (enable listing suspended users on search), but even with that enabled I don’t think they appear in the user directory.
I think they also have their user cards hidden as well if suspended, even without that user preference.
Let me suspend one of my most troublesome test users and check.
Edit: Note for future travellers who land on this by search - I actually got this muddled with ‘deactivating’ them as well so read further down. 
