Are all hydrolysis reactions non-redox reactions?
Hydrolysis refers to any compound reacting with water, including cases where the water acts as an oxidizing or reducing agent.  Magnesium silicide, for instance, reduces water leaving both hydrogen and oxygen from the water in negative oxidation states:
$$\ce{Mg2\overset{-4}{Si} + 4\overset{+1}{H}_2O -&gt; 2Mg(OH)2 + \overset{+4}{Si}\overset{-1}{H}_4}$$