As for the alternative options like Lyft and Uber they mentioned, those are only viable for privileged upper middle class commuters, so it really can't go that far to explain a claimed drop in ridership. And it's just crass to claim that there's a statistically measurable number of fare jumpers.
EDIT: https://www.cbsnews.com/news/mta-why-has-the-nyc-subway-gone...
Genuine question: why is that? I'm not familiar with the mechanics of the NYC Metro area, but I'm familiar with SF's BART, which certainly claims to have statistics on this -- about 22,000 fare jumps a day, as compared to around 433,000 trips per weekday, meaning about 5% of riders are freeloaders. (They claim this costs about $25M a year.) The San Francisco Chronicle did their own reporting on this, and at the very least it backed up the assertion there were a statistically measurable number of fare jumpers.
There was an article in the New York Times in May, titled "How 2 M.T.A. Decisions Pushed the Subway Into Crisis" that claimed higher ridership is not the main cause for the recent decline:
> For years, the Metropolitan Transportation Authority told us that rising ridership and overcrowding were to blame. Yet ridership actually stayed mostly flat from 2013 to 2018 as delays rose, and the authority recently acknowledged that overcrowding was not at fault.
That statement doesn't contradict yours (shakes fist at well-qualified statement), but I found it surprising when I came across it and I imagine others might as well.
[1]: https://www.nytimes.com/interactive/2018/05/09/nyregion/subw...
Did you mean to say "a few dozen more cars"?