I've just checked the .tra file in the hotfix and the description correctly says necromancy. Are you sure you're using it?
Sorry I didn't notice it...the pinned hotfix (outdated for v2.9) was just too shining
EDIT:
I've downloaded the hotfix for SR2.9 and took a look into it. The .tra file changed a lot, however, not all spells were updated to their description (e.g. disintegrate still deals fixed 100 damage). Maybe they will be finished in SR3?
Additionaly, I wonder whether drastic changes to some *key* spells such as Spell Shiel (totally reworked) and Dispel/Remove Magic (school changed back to Abjuration, now affected by SI) would hinder the efficiency of enemy AI
At last, for Spell Shield. In vanilla game it is the UNIQUE spell that protect the caster from ALL spell protection breakers (ruby ray, Khelben, pierce shield, etc.). Spell Shield + SI:Abj would effectively force enemy magi to spend two more spell before they can strip your fully-buffed magi nude with a successfull DM. Also I think its new version is too powerful, 'cause it functions very similar to potion of magic shielding, which can be as rare as green PFM scrolls. After all, I personally prefer the vanilla version