One of those exceptions is potentially rather significant here, though. From immediately after the part you quoted:

unless:

when the invention was conceived or “reduced to practice” (actually created or a patent application filed) it related to the employer’s business or actual or “demonstrably anticipated” research or development,

That said, the article you linked to seems to be about patents covering inventions rather than copyright covering creative works, so without reading more about the laws in those states I don't know whether any of this is actually relevant in this case.