The appearance is extremely "clean and pleasant", but beyond that, I would have to know more structurally to be impressed. He walks out, lies about his weight, and does a little bounce. You easily see the deck move from the little bounce but there was already some deflection from him walking out slowly to the corner. Hard to tell how much existing deflection was temporarily corrected by his light bounce. While as engineers, we understand the deflection is to be expected, living with that deflection can suck. You never fill a cup of coffee too much and feel the bouncing anytime someone walks around on the deck. It is a lot easier if only 1 person is on the deck, but not so easy with multiple people. Get that cup of hot coffee tipped to your lips when some hefty person walks up behind you on the same joist you are on, and you wind up wearing the coffee. Having the decking will increase how fast someone walks on the deck, changes direction etc. as compared to his slow walk out and bounce while partially holding onto the railing.
Most of the deflection is probably from the joists, not the 2 columns. None of the compression faces have a flange, and the edge plates have no flanges. Back to Back Channels would have been a better choice. Tapers also affect deflection calcs whereas they do not affect internal loads. While adding the decking will help distribute the load, it also causes you to feel load at times due to the distribution. Distribution means loads in an isolated location partially route to another area.
I think the design load is 60 psf for a balcony such as this. That would be well over 7,000 lbs where he claimed to be 150. From what I saw, his profile matches the old Alfred Hitchcock profile from his show (only us old geezers know what I am talking about). He also said it was sturdy as can be while easily being seen bouncing some.
But, it is "Purdy".
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