Theres a good chance it had to be a private room because they were taking the chance of being seen. Kash is not an unknown person - he is recognizable. If he is recognizable, people will take notice of who is with him. And this board is not unknown so there couldve been a chance that someone familiar with this board saw them.
It had to be a private location given Kash's background in intelligence unless they WANT people to start putting the pieces together for a Q reveal.
Now we know Soros = Ukraine because NBC called it a conspiracy theory.
https://www.nbcnews.com/politics/trump-impeachment-inquiry/how-anti-semitic-conspiracy-theory-about-george-soros-fueling-allegations-n1094886
Andriy Telizhenko, a former Ukrainian diplomat who has alleged Ukraine’s government conspired with Democrats in 2016, said he’s been told that people associated with liberal megadonor George Soros, including former Ukrainian politicians, are working against him — possibly because he’s helping Giuliani continue investigating President Donald Trump’s political opponents and undermine the credibility of the House impeachment inquiry.
SOROS = UKRAINE
https://www.opensocietyfoundations.org/newsroom/the-open-society-foundations-in-ukraine