No, I think in that case it won’t help.
For me there were still some remains of the Google Nest thread network somehow in the Google APIs that the Android companion app uses and clearing the app data helped. But If you never used a Nest Hub (or Nest WiFi) then there should be no remains of another Thread network.
The ZBT-1 should be used with the extension cord as directly attaching it to USB could cause some interferences but this should only lead to limited range and not to general commissioning failures.
You can try this alternative approach to add the Smart Lock to OTBR (I never tested this as my HA Yellow has no BLE):