I never heard of the Plato connection when I worked on Star in the 80s at Xerox. This is news to me. I’d really like to see more documented proof of this.

I also working on the Multilingual stuff (I implemented the bidi stuff in the Star editor) with my friend Joe Becker and never heard of influence from PLATO. I’ll ask directly next time we talk but I just don’t believe it’s true at all.