Hi @Sir_Ivan
I've tested the new feature of the Watchtower 1.6.0 but don't see the same behavior as in your video.
The behavior in the video:

You drop the 03_Assets folder and get the whole structure of the dropped folder.
The behavior on my side:

I drop in the 1_RAW folder and the structure is still flat (only the folders that have footage in them are shown but not grouped neither in the 1_RAW level, nor the 11_Video level)
I'm on Windows 11 25H2 (Build 26200.8246) and Premiere 26.2