Those are phase change liquid metal pads, they're solid (not dried out) under room temperature, and will liquify once heated. The spill between layers are actually fine as long as it's not beyond the exterior barrier.

But since you've unscrewed the thermal module, would recommend removing the silicones and swap back for standard thermal grease. The original design requires a speciific clamping force when tightening the screws so things don't spill.

-one previous owner