Farming Felwithe Guards (as Necro)

[Axoc]

According to the wiki, the Felwithe guards are all immune to magic:
[ http://wiki.project1999.com/Guard_Kiston ]
[ http://wiki.project1999.com/Guard_Meadom ]
[ http://wiki.project1999.com/Guard_Settine ]

But according to this YouTube video and the comments (which is about 8 months old now) , they obviously aren't immune to magic, as a necro is killing them with spells:
[ http://www.youtube.com/watch?v=wrW3oZwH8gs ]

Here is an update video which is about 7 months old by the same necro (Hathan):
[ http://www.youtube.com/watch?v=EFY61B8h2is ]

In the videos, he is killing different guards, but the wiki doesn't seem to have articles for the guards he is killing, so I've just assumed that the information is true for all of the guards. I tried contacting Hathan himself but he doesn't seem to be in-game and his last YouTube activity was 6 months ago, so I assume he has gone inactive.

Was there an update that made them immune to magic and nerfed guard farming or is the wiki inaccurate? What's a good level to farm these guards if they are still farmable? Hathan is 53 in the second video, not sure what in the first video, but according to the wiki, the guards are 40, so they wouldn't give him experience, right?