I've talked with them about this before. Toytec is not allowed to suggest running bilstein shocks with OME coils. There are a few reasons for this. As already stated, the manufacturer says they are not compatible. Therefore if your shock blows it will not be covered under warranty. Toytec is not going to suggest a setup that is going to void your warranty (common business sense). They also say that spring perch sits at different spots on the OME shock compared to the bilstein shock, so the amount of pre-load on the spring is different and the actual lift height you will get is unknown. It's not something they will test to find out either because it is a setup that will void your warranty. They suggested either run OME springs with OME shocks, or run Bilstein shocks and Eibach springs.
With that said, I know there are a lot of people have run them together, and Toytec said that they will physically work together. But they cannot guarantee a lift height, and the shocks will not be under warranty. It's not something they can recommend. So its just a risk that we as buyers have to take if we want to go that route.