Ahh sorry, but I've gotta step in on this one. What are you on about? The Spurs could have won the Championship in 2017 before he got Zaza'd. The reason the Spurs were also a rebuilding team a couple of years later was because he screwed them over.
I don't think Shaq was totally wrong, but I think it was a combination of his arms and hands. Kawhi and MJ have already disproved the big hands thing, so if people believed Shaq, I don't know why nobody used MJ as an example to disprove that since MJ was a decent shooter who had big hands (not sure how they compare to Shaq's size wise). Anyway, I am guessing the ball would have felt very light to him. Anyone ever heard of a sport called Netball? I've shot the ball a bit and it's weird. The ball is smaller than a basketball and lighter. The distance you shoot is also shorter, but it's harder shooting that ball from a couple of meters out compared to a basketball from the same distance as it's smaller and lighter. I think the hoop is also smaller diameter. That's probably what a basketball felt like to Shaq, but maybe even lighter, so not that easy to shoot from distance with.
Having said all that, I don't know what it's like to be Shaq's size and how it would feel shooting the ball with his arms, hand size and strength. Plus, for all I know, as usual, he could be full of shit and making that up to cover up for his poor shooting. I don't believe what that guy says at least half of the time.