If an eid is pasul he cannot be an eid for kiddushin.
And I’m sure he told him quietly and privately. That it is in the media is likely because he told someone what happened to him privately, and from there it spread. (And still none of the reports indicate who it happened to.)
The iphone has the capability to instantly and privately go to all strictly halachicly forbidden sites. And in Eretz Yisroel they have long been makpid to make sure the kehilla members do not have such a powerfully destructive device always on their belts.