I think the title is misinterpreting what Rybar said. “Deployed” in this case almost certainly means on the other side of the river, but close enough that the bridgehead still falls within its protection. An S300 system is a network of several vehicles, it would be tremendously vulnerable in a small space like a bridgehead. Plus, you’d probably need a pontoon bridge ready to get the system across, and I believe the consensus atm is that the pontoon is still being put together.

Hopefully they can get the bridge in and start pushing to Crimea

Now that is a large umbrella.