From 'Protect':
Protect: Choose a friendly ASURYANI INFANTRY or ASURYANI BIKER unit within 18" of the psyker – add 1 to the saving throws made for that unit until your next Psychic phase.
I believe he's asking if the Ulthwe Craftworld Attribute that allows him to ignore a wound on a 6 would instead occur on a 5+ with Protect. The answer is no, as abilities that allow you to ignore a wound are not saves.