I've never seen a silicone product described as a "dielectric grease" before. Silicone greases have a reputation for creeping, that is, migrating along surfaces. I've always been under the impression that silicones and electrical interfaces don't go together at all. A colleague of mine used to work for a company which banned the used of silicone furniture polish in their admin building for fears that it might somehow get transferred in to the assembly area.
Talking to grease manufacturers about electrical contacts, the response which comes back most often is to use lithium-based grease.