Firstly, thanks for posting the videos.
With the L-rod video I see that you also wrote a note: "Video showing Lrod targeting. We can see clarly the rod turning around without any trick ."
I am sure there is no intentional "trick", but then dowsing is not about that.
It is about tricking yourself into believing that the rod moves by some external force and not by micro movements of your own hand.
The second video also has an associated note: "has you can see it's difficult to get a precise targeting with the device . Lrod is really better !"
Yes, I agree. The Mineoro video shows the same kind of random beeping that we have come to expect.
The big question is ... did you recover anything resembling gold from the "detected" location?