Yes, I did some cursory analysis, and this would be by far the biggest—meaning combination of fastest and most precipitous—collapse in baseball history, supplanting even the gold standard of the 1951 Dodgers.
But remember: massive collapses are never one-sided. It takes more than the first place team losing a lot—it also takes a second-place team winning a lot. In 1951, the Dodgers went 27-24 after August 11, but the Giants went 38-8. So the Dodgers didn't even suck then like the Tigers do now. They were simply up against an irresistible force.
There's always two sides to a massive collapse.