The 2021 Braves went 18-11 in Sep/Oct. The 2022 Astros went 22-9. The 2020 Dodgers went 17-7. THAT list goes on, too, and it's most likely much longer than your list.
You have to go back to the 2015 Royals to find an eventual WS champion that was below .500 after Sep 1st to finish off the regular season - and even that team went 5-0 at the end, so they didn't exactly limp into the playoffs.
I strongly believe that the perceived randomness in baseball is different from the randomness of flipping a coin. It's more a result of changing mental states over the course of the season. For a group as tightly-knit as a baseball team, there's certainly group psychology effects at work, that either lift or depress a team's collective performance. They can be on short timescales (like the Braves' current struggles) or last for months (like most of the Mets' seasons). But these are all human beings, so they are subject to feelings like fear, doubt, exuberance, excitement, emptiness etc. creeping in and affecting performance. We saw it with the Braves last season, who experienced the emotional high of achieving an extraordinary goal, followed by the emptiness that often kicks in afterwards. Unfortunately, they were never able to focus their energy on the next bigger goal.
Good news is that for the current team, there's still time to get back to their accustomed energy level, and it doesn't take much to get out of their current lull. But they will need to get out of it. If they limp into the playoffs in their current mental state, chances are we'll be mourning an early exit.
This is the moment when Snit's "people skills" are essential, and can make us forget about his tactical shortcomings.