The article says "adhesive" and "glue". No mention of tape.
Who knows what the glue or adhesive was. If you used the wrong type/size screw and went into a soft part of the roof those could fail as well. Not to mention the bracket could come undone with the wrong type screw/nut/washer.
Even the orientation/angle of the panel and where it was mounted could make a difference not to mention the speed of the vehicle traveling and the prevailing wind force.