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So shadowstrike allows striking scorpions to outflank via infiltrate. As per page 94 of the brb , they may outflank with their vehicle.

Shadowstrike also states that it cannot affect an autarch. If he is deployed in the outflanking vehicle, does the vehicle lose the ability to outflank, since he cannot, or can he ride in with the outflanking vehicle despite not having the infiltrate USR?

Vendettas outflanking with vets have made me ponder this.

Shadowstrike is what gives the vehicle outflank therefor you can not use the ability if autarch is attached.

+1 to above: you lost Infiltrate when you attached an Autarch, therefroe in no way can the vehicle gain Outflank - the rule that confers it has gone.