Fariĝi is an intransitive verb (as are all verbs with -iĝ-), so it doesn't take a direct object, so no suffix -n.
What part of speech is flegisto here?
And never mind, the answer is: predicate nominative, renaming the men.
En "Kurso de Esperanto 3.0" oni lernas malsanisto! gxi devas esti akceptata
This word appears to be a Googlewhackblatt, in that the only place in the entire Interweb where it can be found by Google, is in the above sentence :-) .
Glorious! Thanks for tracking that down. Yet another example that in the 21st century there's no shortage of information, but sometimes good advice is hard to come by.