Notice the posts farthest from the house (4x4s). The 2 posts closest to the house were 2x4s, not anchored to the house and just sitting on top of the ground. You could actually swing them around, so the deck was holding the post up.
I didn’t walk on that deck, but the pest control guy did–he got on it from inside the house without looking at it carefully outside first. Could have been a big mistake (he’s a hefty guy).