Look at the magic effects used by destruction spells. They don't use the keyword "MagicSchoolDestruction". Ice spells use "MagicDamageFrost", fire spells use "MagicDamageFire", and shock spells use "MagicDamageShock".
You'd have to go through all the effects and add "MagicSchoolDestruction" if you want to use it in an entry point.
I'm not sure about staffs, but that entry point with MagicDamageFire would affect any shouts that use that keyword.
Also, blank wiki pages are not uncommon. The vast majority of the conditionals for spells and perks are undocumented.
Edit: wiki page is no longer blank