Ann: Successful Completion of Retail Entitlement Offer, page-128

They are not going to publish information as to the reason/s why he left, no company ever does. The usual corporate lines are used, pursue new interests, family reasons, taken a new opportunity etc etc and we thank him for his service.
Why would NUH say anything different.
If you dig around, it wasnt the happiest of parings. They hired a guy to pursue opportunities in the US market but didnt listen to him.
As for the rest of your comments, they are the usual tropes. I doubt RealTek is there to simply fund the BOD. Your argument is nonsensical.