The Drive comments on the report tweeted above.

I would note a couple of things.

This kind of attack, against a fixed structure, does not require any contact with the USV once it is launched because its guidance can be entirely preprogrammed. That may have some disadvantages, but it also means there are no emissions from the UAS that might be intercepted.

Second, the explosion was not close to one of the supports, and it did not explode under the lift bridge section which would have been the more vulnerable part of the bridge. I doubt it did much damage.