The blog you've shared was helpful for manual entry. QBO currently doesn't have a direct connection to the barcode scanner. However, we've got you some third-party applications that have this kind of functionality and can sync with QBO. You can go to the Apps center in the left navigation and search for any barcode scanning apps.
In the meantime, I'll pass your feedback to our developers. It will be a useful reference for our future updates.
If you need anything else, please let us know. We're happy to help.