Why? He was having fun with a kit he found at a yard sale, fair play to him for that. He also showed some sense in not following the instructions to the letter and bottling it after a week.
:hat: to him, from the comments it seems he went on to reuse the kit with fresh ingredients to some success.
Depends, if the ingredients were in a tin that showed no signs of corrosion or damage then I can't see there would by much problem. If they were in a plastic baggy and had new life forms evolving in them, then yeah, that would be daft.
I've got a tin of John Bull beer somewhere in storage, I'll have to check the date on it when I can find it, and then make it up with some fresh yeast.