I would have thought that damage involving a hole in the fuselage breaching the pressure cabin would be more likely to be classified "Substantial". If the photographs are genuine, this is a wee bit more than "bent or dented skin".
There's a SAAB that's been flying for 30 years following an accident where a propeller blade entered the cabin. You can't see the repair and hardly anyone that's flown it would suspect it unless they knew the story. The hole in this one is tiny compared to a blade going through.
Loud bang at low speed, reject. Loud bang at high speed before V1 but no other indications of problems, probably continue depending on the exact nature of the "bang" but this is where the captain earns his money! Loud bang above V1, continue and work it out airborne.
That said, from up the front of a Saab with both engines at takeoff power and noise cancelling headphones on, I expect the crew didn't even hear a loud bang, unlike the unfortunate passengers who were much closer to the action.
Same as with moderate icing, the noise of ice hitting the fuselage is very noticeable in the cabin and only the larger chunks audible to the cockpit.