Around the 2 minute mark in the video you can see he's ratchet strapped the panels together, and in turn that strap is attached to the roof (looks to be looped around a pipe?).
So he's not just relying on the wind rating of the panels.
A better and perhaps code compliant way to do this (this is sometimes done this way here in NL, no idea about the US) is to bolt the panels to e.g. an aluminum frame, which you'd then hold to the roof with ballast, e.g. cinder blocks or heavy yard tiles.
Depending on the panel area, frame and amount of ballast you can easily prove that there's no way the result would move due to weather, unless you were experiencing such apocalyptic winds that the house itself would be destroyed anyway.
So he's not just relying on the wind rating of the panels.
A better and perhaps code compliant way to do this (this is sometimes done this way here in NL, no idea about the US) is to bolt the panels to e.g. an aluminum frame, which you'd then hold to the roof with ballast, e.g. cinder blocks or heavy yard tiles.
Depending on the panel area, frame and amount of ballast you can easily prove that there's no way the result would move due to weather, unless you were experiencing such apocalyptic winds that the house itself would be destroyed anyway.