I don't think I said that - nor was I trying to say that.
There are a lot of probabilities in baseball though. If you trade for an all-star at the trade deadline, the probability of them producing down the stretch and into the playoffs is MUCH higher than if you add some role players having poor seasons (like Roserio, Soler, etc.) - but the cost is also higher for the all-star. An interesting example is when the Jays had to give up Steve Karsey to get Rickey Henderson in 1993. Rickey is one of the best of all-time and was a superstar rocking a .327 average and a 182 wRC+ (4.4 WAR) when we got him. He went on to hit .215 with a 90 wRC+ the rest of the way. Did that mean Pat Gillick was a bad GM? Was there some illusion he ought to have known Rickey would suck in TO? If the Jays didn't win the World Series, would it have been fair to blame Gillick for adding Henderson? No - obviously not (or at least I don't think so). There was probably a 5% chance Rickey would play that bad for the Jays - but that's exactly what happened. Nobody's fault - that's just how probabilities work. Sometimes you can make the right decision and get sh*ty results.
The reality is that GM's can't predict outcomes. Their team may see something in the underlying stats that they think gives them an advantage - so when they're sifting through the scrap heap, the guy they pick may have a slightly higher probability of success, but it's marginal. If there was a high probability that Roserio, Soler, Pederson, Duvall were all going to play that well down the stretch, then the price to acquire them would have been higher. Braves gave up Bryce Ball, Alex Jackson, Pablo Sandoval (yes - the Panda) and Kasey Kalich to get those 4 players. It cost him essentially nothing to add those 4. It was a low risk move that paid off beyond his wildest dreams. As I said several times, kudos to AA. I do like his approach of throwing multiple pieces against the wall - that increases the probability that something sticks.
There is an old adage that "you have to be good to be lucky and lucky to be good". AA is a good GM and thus sometimes - good things happen.
For the same reasons, I'm not going to blame AA for the Braves playoff failures in 2022 or 2023. They had the teams to win the World Series in both of those seasons. I'm not going to second guess why AA didn't add more to push those teams over the top or suggest he ought to have been more aggressive at those deadlines. The playoffs are a crapshoot.