typical failure from lack of proper joist attachments. Band still attached to house, but joists pulled away. insufficient & improper hardware attachment. Deck very well could have had a hot tub on it, or too many people. It happens. People don't think about water weighs 8.3 lb/gal, so a little 200 gal hot tub weighs over 1660 lbs in water alone, not incl the tub or people. Girder double is too small, and on two 4x4 posts (span too long).. . Used to see stuff like that, but in our area, they really cracked down on deck inspections about 20 yrs ago after some serious accidents and fatalities. Deck design and inspections now a very technical and expensive process in my area, but we rarely see that kind of failures now.