Well, in your situation the data recovery specialist should be shure about the problem is in the USB-SATA bridge exactly. Anyway, to verify the correctness or incorrectness of this statement you should create connection through USB bridge directly to the SATA signal output of the processor of PCB.
It is simple, the signal pairs can be traced across the paths from the processor to the bridge and near the bridge will be installed pairs of capacitors. You have to unsolder it and soldering 4 sata wires directly to the roads which going to the central HDD processor. The wires should be soldering by pairs and you can easy to find the right combination, even brute force is not difficult.
USB to SATA bridge on the laptops Samsung storages. Var 1.
USB to SATA bridge on the laptops Samsung storages. Var 2.
USB to SATA bridge on the laptops Samsung storages. Var 3.
Once the desired combination is found, if the problem was only in the USB-SATA bridge, you get ready in the ATA registers and the ability to work with the disk on SATA port like a normal SATA drive.