When I first read the article I assumed that the description was overstated and that either a piece of the concrete railing gave way while leaning against it, or they climbed over the railing on to the extended concrete platform, which I would have advised against. If the bridge had actually collapsed, why just a selfie photo? My brief search did not find any photographic evidence revealing exactly what happened. The computer generated reenactment is probably closer to the truth.
"Are you prepared for total destruction"