If new nobles are protected from infil stabbing, then surely their paraphernalia/troops would also be immune to these other newly proposed infil mechanics as well. Also, I believe that new player protection only lasts for a very short time. (Two weeks?)
If you believe that people are deliberately abusing this mechanic on a regular basis, then file a report.
It is interesting to note that the new character that had not moved since it was moved into a prime scouting position, moved away immediately after the quoted post.