>>69079779JP defamation laws are famously draconian and intentionally ambiguous.
All they'd need to do is prove that damage occurred as a result of her public statements, regardless of whether they're true or not.
As for being a foreigner contractor employed by a Japanese company, I'd imagine actually enforcing it gets iffy, but at the very minimum, it'd make finding work or sponsors in Japan difficult.
I'm not a lawyer by any stretch of the word though, so this is all just going by reading the articles. It's up to their lawyers to prove damages were a result of her statements, so I guess it could be argued that Anycolor did everything to themselves, which would be hilarious.