Spooky Dude was concerned about appearances.
Again, he's worth over $14B. People with this kind of mega-wealth aren't concerned about a holding with an entry value of less than $200K. They have money-managers that buy and sell tens-of-thousands of shares each day, mostly using computerized pre-determined metrics. Soros wasn't a top-5 holder, in fact, he owned so little of the stock, it wasn't even SEC reportable by OSIS.
Normal people, like probably you and me, see "11,000 share", and think to ourselves - "OMG, that is a HUGE holding, he must have thought about selling that for months". He didn't. I'd bet a week's pay, he didn't even know he owned it, let alone was aware that he sold it.
Lastly, the stock has just come off its 52-week high, where it enjoyed a 200% increase. This is EXACTLY the kind of time a predetermined metric would execute, causing the stock to be sold.
Not everything is a "secret cabal".