Maybe they can pull a fucking Gintama action and just show the story board and have the characters tell the viewers that the animators didn't make the deadline :)
I believe most game dev studios have similar levels of turnover for new developers. I guess it shouldn't be surprising, both industies rely on the passion of their employees to get products out the door, while under-paying and overworking them.
The source the article gets that 90% statistic from, the anime dormitory project, is actually a pretty good charity if you're looking for ways to support animators and their working conditions. Right now they're subsidizing housing for more than 10 animators, and I think there's a fundraiser still running at the moment that's trying to make real change to improve the industry's working standards overall. Here's a recent YouTube video they made on the subject.
They could invest in their own domestic animators instead of paying them scraps while demanding a lot. Maybe they'd stick around then and you won't need to outsource anymore.
I think this is largely of problem of their own making
Every season, there are some shows that have bottom-of-the-barrel art quality and framerates.
But when I say that, the quality at the lower end of production is about comparable to the old school broadcast TV shows, just not up to today's high standards.