It says any Death wizard knows X spell under the summoning, so yes the could. Anything in bold refers to units with that word in its keywords list. E.g. a liche priest has death in it's keywords so is a 'death wizard'
Me: To be honest im amazed there isn't a chaos god of not revising or at least chaos god of procrastination
MidnightSun: There will be, when enough people do it. Y'know when the Eldar were all engaging in their hedonism and Slaanesh ripped open the Eye of Terror with his creation? Slaanesh will have NOTHING on the God of Procrastination, and his vile minions will carve the galaxy asunder in a thousand year reign of blood.... Tomorrow