For papaya that produces fruit too high to pick standing on ground, growers lay the trunk flat on the ground.
They then cover the roots.
Later on the shoot bend up.
The tree produces fruits at ground level.
No need to use a ladder to pick fruits.
In the video, they slice the trunk so they can bend the top down.
This is not as low as the previous technique, but low enough.
The is no improvement to canopy nor roots so in no way that technique produces more fruits.
This is just my guess.
I don't know what they are saying in the video.