Not really. It sounds like they haven’t gone after them for emulation, but instead for emulation-adjacent things: copying ROMs, circumventing digital locks, etc.
They explicitly mention (one of?) the developers of Yuzu sharing ROMs in the article.
In other words, the emulator itself isn’t illegal, but in order to use the emulator the way most people want, you have to do illegal things, and that’s what they go after you for.
They’re Japanese patents, so maybe they’re already circulating in Japanese media and haven’t been translated yet.
Alternatively, maybe the Japanese Patent Office requires you to follow some bureaucratic process to get a copy: like you have to be a lawyer and it takes 4-6 weeks to get your reply. I don’t know, but Japan just finally got rid of its last laws requiring floppy disks for certain processes a few years back, so it’s not out of the realm of possibility
I mean, you got my upvote already, but one big reason is that Robertson wanted to control all the manufacturing of the screws and the bits. Phillips licensed his patent out and let anyone make them just taking a tiny licensing fee. Made a fortune on volume. Robertson: good engineer, bad businessman.