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The top melody is not what you are playing on the instrument at least in the first part of the video (I stopped watching after I realized the music IMO did not seem to match the visual). If I look at the movement of your thumbs/fingers you are playing the accompaniment only. Where is the top melody coming from?
this is a fake the fingers are often not on the low notes when they are played the same way from time to time the fingers pinch the strings of the lower notes while the high notes are being played