Simple Q&A Pathfinder (By RAW) I

[gomanfox]

A 61

Pick one spell when you choose this trait. When you apply metamagic feats to this spell, treat its actual level as 1 lower for determining the spell’s final adjusted level.

You cast all of your spells as if they were modified by the Silent Spell feat

As it is written, for Magical Lineage to reduce a spell's level, it must have a metamagic feat applied to it. The benefit of the Deaf Curse isn't applying the Silent Spell feat to the Oracle's spells, it is just giving the benefit of the feat to the spells for free, so Magical Lineage would not apply in the example you gave.