I hate to sound critical, but what you have there does not look very safe.
Are those posts just sitting on top of the ground, not dug in or attached to piers? If so then the deck has zero lateral support, you relying on the fence to stabilize the deck? I realize the deck is not very big but 3, 4, 5 people moving around on it at a time, jumping off into and pulling themselves up out of the pool, being that far above the ground applies a lot of leverage, it needs to be more substantial.
Your rim joists should sit ON the posts or be let into the post not just attached to the side of the post with a single bolt. There is nothing to stop many of those posts from hinging on their bolt and kicking out. Especially after the lumber shrinks and the joints become loose. Did you use the correct hot dip galvanize bolts? Treated lumber WILL rapidly corrode regular zinc hardware and cause sudden failure.
How are the angled timbers attached to the posts, the scenario you have going there is very difficult to adequately fasten them together, again these should be sitting on or let into and bolted or plated to the posts.
I don't see any joist hangers, the rim joist was already in place against the fence before the stringers were installed. That means you toe nailed or angled screws through the floor joists into the rim joist, that is not nearly good enough. The joists crack and split at the fasteners when attached like that.
I'm sure this will work for a while and may seem strong enough right now. As the wood dries out and gets subjected to weather, pool water and weight it will begin to come apart. I hate to see people get hurt, I'm afraid you have a recipe for that here.