How about taking a look at what Info Warfare Actually Does OP:
Relevant Code:
<InvasionStyle>
<InternalName>ConventionalWarfare</InternalName>
<Title>CONVENTIONAL_WARFARE_TITLE</Title>
<Description>CONVENTIONAL_WARFARE_DESCRIPTION</Description>
<Prerequ>
<Techs>
<Option>TechTree</Option>
</Techs>
</Prerequ>
<ImmunityStat>IsImmuneToInvasion0</ImmunityStat>
<ImmunityDescription>IsImmuneToInvasion0_Label</ImmunityDescription>
<Cost>0</Cost>
<DefenseMod>0.0</DefenseMod>
<ResistanceMod>0.0</ResistanceMod>
<SoldieringMod>0.0</SoldieringMod>
<InvaderCasualtyMin>0.01</InvaderCasualtyMin>
<InvaderCasualtyMax>0.25</InvaderCasualtyMax>
<DefenderCasualtyMin>0.4</DefenderCasualtyMin>
<DefenderCasualtyMax>1.0</DefenderCasualtyMax>
<ImprovementDamageThreshold>0.95</ImprovementDamageThreshold>
<SurfaceDamageThreshold>0.99</SurfaceDamageThreshold>
</InvasionStyle>
<InvasionStyle>
<InternalName>InformationWarfare</InternalName>
<Title>INFORMATION_WARFARE_TITLE</Title>
<Description>INFORMATION_WARFARE_DESCRIPTION</Description>
<Prerequ>
<Techs>
<Option>InvasionOptimization2</Option>
</Techs>
</Prerequ>
<ImmunityStat>IsImmuneToInvasion1</ImmunityStat>
<ImmunityDescription>IsImmuneToInvasion1_Label</ImmunityDescription>
<Cost>1000</Cost>
<DefenseMod>-0.25</DefenseMod>
<ResistanceMod>-0.25</ResistanceMod>
<SoldieringMod>0.0</SoldieringMod>
<InvaderCasualtyMin>0.01</InvaderCasualtyMin>
<InvaderCasualtyMax>0.1</InvaderCasualtyMax>
<DefenderCasualtyMin>0.1</DefenderCasualtyMin>
<DefenderCasualtyMax>0.25</DefenderCasualtyMax>
<ImprovementDamageThreshold>1.0</ImprovementDamageThreshold>
<SurfaceDamageThreshold>1.0</SurfaceDamageThreshold>
</InvasionStyle>
Info warfare is mostly useful for dealing with low defence mid resistance planet's. But if the base resistance and defence values are high enough it will have no benefit. For example if they have 0% defence a starting resistance of greater than 33% will result in a net increase in your losses.
Basically on average conventional warfare will kill 28 enemies for every 5 of yours that die, while info warfare will kill 20 of yours for every 28 of theirs.
It's basically useful for taking poorly defended planets without damaging the infrastructure. or population overmuch.